Mechanical part polishing equipment

The mechanical part polishing equipment comprises a box body with an inlet and outlet formed in one side, a box body which penetrates through the inlet and outlet and slides into the box body is arranged on the outer side of the box body, a clamping mechanism and a supporting mechanism which are used for fixing a machined part are arranged in the box body, and a polishing mechanism is further arranged in the position, above the box body, of the box body; the clamping mechanism comprises a positive and negative screw rod which is arranged at the bottom in the box body and driven by a motor I, vertical plates located on the two sides of the machined part are arranged on the positive and negative screw rod, a rolling bearing I is further arranged at the top of each vertical plate, a rotating shaft is arranged in each rolling bearing I, and a clamping plate abutting against the corresponding tail end of the machined part is arranged at one end of each rotating shaft; the polishing mechanism comprises a cover body