Metal part polishing machine for assembling large engineering machinery

The utility model relates to the technical field of metal processing, in particular to a metal part polishing machine for assembling large engineering machinery, which enables the working efficiency of the device to be improved, enables the polishing condition to be observed in time, and improves the practicability of the device. Comprising a base, a lifting mechanism, a driving mechanism, a first connecting shaft and a first polishing piece, the lifting mechanism is mounted on the base, a mounting plate is arranged on the lifting mechanism, the first connecting shaft is sleeved with a rotating movable bearing, and the input end of the first polishing piece is in transmission connection with the output end of the driving mechanism through the first connecting shaft; the polishing device further comprises a first belt pulley, first fixing plates, connecting rods, a transmission shaft, a second polishing piece, a second belt pulley, a belt and a displacement mechanism, the first belt pulley is fixedly arranged