the invention provides an injection molding method of stone - based composite material and equipment thereof , wherein the method comprises the following steps : a . putting raw materials into a charging device and then pushing the raw materials into a preforming machine barrel of a preforming device by a pressing component in the charging device ; b . keeping the temperature being between 15 ° c . and 55 ° c . and compacting the raw materials with the rotation of a preforming screw and transporting the raw materials into a collecting block ; c . injecting the raw materials into a mold through a mold gate under the injection force of 50 mpa to 180 mpa ; d . keeping the temperature of the mold between 140 ° c . and 200 ° c . and curing time between 40 seconds and 300 seconds ; and e . opening the mold to get the product . the invention has the advantages of simple production process , high acceptance rate of products manufactured , high production efficiency and low production cost . the product has the advantages of high mechanical strength , good fire resistance , thermal stability , corrosion resistance and electrical property , low cost and the like . the product is capable of substituting the majority of thermoset plastics and thermoplastics , thus reducing the usage amount of plastic products and providing powerful support and safeguard for creating resource - conservation and environment - friendly industry .