Magnetic steel grinding machine

The utility model relates to the field of grinding machines, in particular to a magnetic steel grinding machine which comprises a grinding box, a grinding channel is arranged in the grinding box in the length direction of the grinding box, limiting strips are vertically and fixedly connected to the two sides of the grinding channel correspondingly, and mounting grooves are formed in the side walls of the two limiting strips correspondingly; the polishing device comprises a polishing box, a plurality of mounting grooves are formed in the polishing box, polishing assemblies are arranged in the mounting grooves, supporting plates are slidably mounted in the mounting grooves, the polishing assemblies are mounted on the supporting plates, sliding assemblies used for driving the supporting plates to move are mounted in the polishing box, and the sliding assemblies are connected with the supporting plates. The sliding assembly drives the supporting plates to get close to each other, so that the polishing assemblies