Automatic grinding device

The utility model discloses an automatic polishing device, which relates to the technical field of aluminum profile processing, and comprises a side plate, a bolt and a cross beam, the surface of the side plate is provided with a polishing assembly, the polishing assembly comprises a hydraulic cylinder, the output end of the hydraulic cylinder is connected with a linkage frame through a piston rod, a tensioning roller penetrates through the linkage frame, the surface of the side plate is provided with a guide groove, and the guide groove is provided with a guide groove. A support penetrates through the surface of the side plate, and a tension spring is connected between the support and the side plate. According to the aluminum profile polishing device, the polishing assembly and the polishing abrasive belt are arranged, the polishing abrasive belt wraps the aluminum profile in a half mode through the tensioning roller and the pulling roller, the four faces of the aluminum profile can be polished at the same t