Polishing device for mandrel machining

The invention relates to the technical field of core shaft grinding, in particular to a grinding device for core shaft machining, which comprises a box body, an opening is formed in the upper end of the box body, a discharging hole is formed in the upper end of the side wall of the box body, a discharging supporting plate is arranged at the discharging hole in a penetrating manner, and a storage bin is arranged at the opening of the upper end of the box body. The lower end of the storage bin is of a frustum structure, a material roller is arranged at a discharging hole of the storage bin, and a clamping and grinding mechanism and a material transferring mechanism are arranged on the inner side of the box body. The storage bin, the clamping and grinding mechanism and the material transferring mechanism are arranged and work in sequence, automatic grinding and feeding and discharging of the mandrels are achieved, the current situation that special personnel need to be arranged for taking and placing the mandrel