The invention discloses a grinding device for the processing of auto parts. The grinding device comprises a base and a rotating table, wherein sliding columns are arranged on the rotating table; one end of each sliding column is fixed through a mounting table; a motor is arranged on the mounting table; a grinding disc is fixedly arranged on an output shaft of the motor through a first locking nut;an adjusting unit is arranged on the output shaft of the motor and comprises an adjusting column; a sliding block is telescopically arranged inside the adjusting column through a spring; an adjustingnut and a pushing table are assembled on the adjusting column in a threaded manner; a threaded column is assembled on the sliding block in a threaded manner; and a propping unit is assembled at one end of the threaded column in a threaded manner. According to the grinding device disclosed by the invention, the regulating unit which can rotate independently is arranged on the output shaft of the motor, and thus the additional mounting of a positioning fixture is not needed when the outer edges of the auto parts are grinded; and by the utilization of the threaded column in the adjusting unit, the positioning and the grinding of the auto parts can be achieved.