Oil leakage prevention structure of injection molding machine

The invention relates to an oil leakage prevention structure of an injection molding machine, which is arranged in an pre-injecting base, and comprises a glue jetting cylinder and a piston component sealed in the glue jetting cylinder and driving a glue jetting screw to perform reciprocating rotational motion, as well as a pre-injecting piston and a pre-injecting piston rod, wherein the piston component comprises a glue jetting piston; a piston channel is formed in the glue jetting piston arranged in the axial direction of the glue jetting piston; the glue jetting piston is arranged in the glue jetting cylinder in a sealing manner; the pre-injecting piston and the pre-injecting piston rod are arranged in the piston channel in a penetrating manner, rotate, and perform reciprocating motion synchronously together with the glue jetting piston; the pre-injecting piston is arranged between the glue jetting piston and the pre-injecting piston rod in a sleeving manner and is fixedly connected with the pre-injecting p