a gasification - liquefaction disposal method , system and equipment for msw are disclosed . the method involves the msw pretreatment of dehydrating and separating , thus reducing water and inorganic substance content of the waste . then , the msw is introduced into a plasma gasifier by a carbon dioxide air - sealed feeding device and gasified therein to obtain hydrogen - rich syngas . the hydrogen - rich syngas is then cooled , deacidified , dedusted and separated to obtain carbon dioxide . then , the hydrogen - rich syngas is catalyzed to produce methanol product in a methanol synthesis reactor . the separated carbon dioxide is sent back to a carbonation reaction chamber of a gasification system to perform carbonation reaction with calcium oxide , thereby releasing heat to provide assistant heat energy for gasification and avoiding greenhouse gas from being discharged into environment . exhaust gas is returned to the plasma gasifier for remelting treatment , thus forming a closed - loop circulation production system and realizing the disposal of the msw with zero discharge and no pollution , thereby avoiding dioxin pollution and converting the msw to chemical raw materials and fuel needed by mankind . the method , system and equipment are suitable for harmless and recycling disposal of msw , industrial high polymer waste , composting waste and waste in waste sorting sites .