Automatic square hole milling device for plastic parts

The invention discloses an automatic square hole milling device for plastic parts, and belongs to the technical field of machining of plastic parts. The automatic square hole milling device comprisesa control structure, a rack, a lifting platform, a working table, a workpiece fixing structure, a hole milling structure, a lifting cylinder, a transverse cylinder and a longitudinal cylinder, whereinthe lifting platform is slidably arranged on the front side of the rack in the vertical direction, the working table is slidably arranged on the lifting platform in the left-right direction, the workpiece fixing structure is arranged on the working table in the left-right direction, the hole milling structure is arranged at the top of the rack and can slide in the front-back direction, the lifting cylinder is arranged on the rack and used for driving the lifting platform to slide up and down, the transverse cylinder is arranged on the lifting platform and used for driving the working table toslide left and right, and