Plastic injection mold with automatic mold opening function

The utility model discloses a plastic injection mold capable of automatically opening a mold, which belongs to the technical field of molds, aims at solving the problems that a plastic product cannot be quickly cooled and molded and the finished plastic product cannot be polished, and comprises a placing groove and a mold, a stepping motor is arranged at the front end of the containing groove, and the output end of the stepping motor is fixedly connected with the threaded rod. A double-head motor runs to drive a second rotating rod and a first gear to rotate, the first gear is meshed with the second gear to drive the first rotating rod and an eccentric wheel to rotate, so that a push rod pushes a clamping plate to move relatively to clamp a plastic mold, meanwhile, a stepping motor drives a sliding block to slide on a threaded rod, and a third telescopic rod is moved; and a third telescopic rod adjusts a polisher to a proper height, so that the plastic mold is preliminarily polished, the subsequent machining