Polishing machine for steel machining

The invention belongs to the technical field of steel polishing, and discloses a steel processing polisher which is technically characterized by comprising a shell, a motor is fixedly mounted on the inner wall of the shell, a transmission rod rotationally connected with the inner wall of the shell is fixedly connected to an output shaft of the motor, and a polishing disc extending out of the shell is fixedly mounted on the surface of the transmission rod; a quantitative polishing mechanism is arranged at the bottom end of the side wall of the shell and comprises rolling wheels, a telescopic assembly and a control assembly, a sweeping mechanism matched with the grinding disc is arranged in an inner cavity of the shell, and the sweeping mechanism comprises a sweeping belt and an automatic rotating assembly. The problems that the polishing thickness of the surface of the steel cannot be accurately controlled through an existing polishing mode, chippings generated by polishing of the surface of a polishing piece