Pushing structure of plastic injection molding machine

The utility model relates to the technical field of plastic injection molding machines, and discloses a material pushing structure of a plastic injection molding machine, which comprises a base, two groups of sliding chutes symmetrically arranged at the top of the base, a mounting cover slidably arranged in an open slot arranged at the top of the base through a mounting plate, and a hydraulic push rod fixed at a position close to one end of the top of the base, the top end of an output shaft of the hydraulic push rod is fixed to the bottom of the mounting cover through a fixing plate, the hydraulic push rod can push the mounting cover to enable the mounting cover to move along a sliding groove in the top of the base, and a first gear and a threaded rod are additionally arranged so that the first gear can drive the threaded rod to move when rotating; the movable threaded rod drives the piston to move so as to push and extrude liquid plastic in the storage tank, only the piston with the corresponding size needs