to make the technical feature , objective and effect of the present application be understood more clearly , now the specific implementation of the present application is described in detail with reference to the accompanying drawings and embodiments . as shown in fig1 , one of the preferred embodiments of the present application to provide an electronic cigarette , which comprises a non - metal outer sleeve 1 and a first paint layer 2 . the non - metal outer sleeve 1 makes the electronic cigarette lighter , feel better , and the cost can be saved . an atomizer assembly ( not shown ) and a battery assembly ( not shown ) are arranged inside the outer sleeve 1 . all external wall of outer sleeve 1 is covered with the first paint layer 2 . paint is sprayed or printed on the outer wall of the outer sleeve 1 to form the first paint layer 2 . the first paint layer 2 can make the outer sleeve 1 have the function of heat insulation , non - slipping , makes the outer sleeve 1 more beautiful and feel better . and spraying or printing paint compared to sticking stickers has simpler procedure and higher production efficiency . understandably , paint of the first paint layer 2 is uv consolidation paint or rubber paint and so on . the uv consolidation paint is a kind of paint conforming to current environmental protection , does not contain any volatile substances . using of the uv consolidation paint makes the electronic cigarette more green , healthy , and environmental . the rubber paint is printed on surface of the outer sleeve 1 , feel of the rubber paint is exquisite , and smooth , appearance of the rubber paint is elegant and solemn . the rubber paint has scratch resistance and weather resistance , excellent wear resistance . the rubber paint conforms to green environmental protection printing , has no damage to human body . fig2 is a structural schematic view of an electronic cigarette of a second embodiment of the present application . in fig2 , there is at least one containing grooves 10 , used for containing the first paint layer 2 , forming on the outer wall of the outer sleeve 1 . the containing grooves 10 extend axially along the outer wall of the outer sleeve 1 and are circumferential grooves ( unlabeled ), the grooves extend to two ends of the outer sleeve 1 , namely , the outer wall of the outer sleeve 1 is completely covered with the grooves , the first paint layer 2 is arranged in the grooves . fig3 is a structural schematic view of an electronic cigarette of a third embodiment of the present application . in fig3 , the first paint layer 2 can only covers part of the outer wall of the outer sleeve 1 , in this embodiment , the containing grooves 10 can be multiple grooves configured separately axially along the outer wall of the outer sleeve 1 , the first paint layer 2 are respectively contained in each groove . fig4 is a structural schematic view of an electronic cigarette of a fourth embodiment of the present application . in fig4 , the containing grooves 10 can be multiple grooves configured separately radially along the outer wall of the outer sleeve 1 , the first paint layer 2 is respectively contained in each groove . advantageously , in the above embodiments , a thickness of the first paint layer 2 is the same as a depth of the containing grooves 10 , further , the thickness of the first paint layer 2 ranges from 0 . 08 mm to 0 . 15 mm , and the feeling and the heat insulation effect are the best . fig5 is a structural schematic view of an electronic cigarette of a fifth embodiment of the present application . in fig5 , the first paint layer 2 is arranged at the area , corresponding to the atomizer assembly , of the outer wall of the outer sleeve 1 . the outer sleeve 1 comprises an atomizer sleeve 11 and a battery sleeve 12 . an atomizer assembly is installed in the atomizer sleeve 11 . a battery assembly is installed in the battery sleeve 12 , and the battery sleeve 12 is detachably connected to the atomizer sleeve 11 . the embodiment adopts threaded connections to detachably connect the battery sleeve 12 to the atomizer sleeve 11 . the battery sleeve 12 and the atomizer sleeve 11 can be detachably connected in screw , socket , buckles and other ways . the first paint layer 2 covers on the area , corresponding to the atomizer assembly , of the outer wall of the outer sleeve 1 . in this manner , the electronic cigarette has the function of heat insulation and anti - slipping , at the same time , can also save paint . further , a suction nozzle is arranged at one end , which is far away from the battery sleeve 12 , of the atomizer sleeve 11 , a suction nozzle cap 4 is also arranged to maintain the suction nozzle cleaning . a cigarette end part 3 is mounted at one end , which is far away from atomizer sleeve 11 , of battery sleeve 12 , a third paint layer 31 is configured on the cigarette end part 3 , paint of the third paint layer 31 is luminous paint . the advantages of adopting the luminous paint is that at night the cigarette end part 3 lights to simulate the cigarette burning , can enhance the users &# 39 ; experience . compared with adopting the led light - emitting diode , adopting the luminous paint has the advantages of saving the cost of production and enhancing environmental protection . fig6 is a structural schematic view of an electronic cigarette of a sixth embodiment of the present application . in fig6 , a second paint layer 5 is added to the electronic cigarette in the base of the embodiment shown in fig1 , the second paint layer 5 can be used to set images and / or logos . the second paint layer 5 is several annular paint layers configured separately on the first paint layer 2 . understandably , in other embodiment of the application , the first paint layer 2 and the second paint layer 5 are arranged in parallel on the outer wall of the outer sleeve 1 . fig7 is a structural schematic view of an electronic cigarette of a seventh embodiment of the present application . in fig7 , the first paint r layer 2 fully covers the outer sleeve 1 . a suction nozzle part 14 is arranged on the outer sleeve 1 , the suction nozzle part 14 is covered with stickers 15 . the stickers 15 belongs to food grade , can protect the user &# 39 ; s health . understandably , in other embodiment of the application , the stickers 15 and the first paint layer 2 are coaxial juxtaposed , namely , the outer sleeve 1 is arranged inside of the sticker 15 without setting the first paint layer 2 , which can save the cost . thereby , the outer sleeve 1 can be the atomizer sleeve containing the atomizer assembly , also can be the outer sleeve used for containing the atomizer assembly and the battery assembly . while the embodiments of the present application are described with reference to the accompanying drawings above , the present application is not limited to the above - mentioned specific implementations . in fact , the above - mentioned specific implementations are intended to be exemplary not to be limiting . in the inspiration of the present application , those ordinary skills in the art can also make many modifications without breaking away from the subject of the present application and the protection scope of the claims . all these modifications belong to the protection of the present application .