Plastic mold clamping mechanism

The utility model relates to the technical field of mold processing, and discloses a plastic mold clamping mechanism which comprises a box body, the multiple air cylinders are arranged on the top wall of the box body, the telescopic ends of the air cylinders are fixedly connected with a movable plate, the movable plate is fixedly connected with the top plate through an extrusion mechanism, and the extrusion mechanism is used for positioning and pre-tightening a plastic mold; the four transmission mechanisms are annularly distributed on the movable plate, and the transmission mechanisms are connected with clamping mechanisms arranged on the inner wall of the box body; the clamping mechanism comprises second guide frames fixedly installed on the four side walls of the box body, second racks are arranged in the second guide frames in a sliding mode, and clamping plates are installed at the ends of the second racks. The extrusion mechanism is used for positioning and pre-tightening the plastic mold, so that the c