The invention discloses a driving device used for grinding a brake disc. The driving device comprises an upper end plate, a support frame, a motor, a lower end plate, a bearing, a gear ring, a driving plate, a first connecting shaft, a vertical shaft, a connecting plate, a second connecting shaft, a driven plate, a driving wheel and an elastic dummy wafer, wherein the lower end plate is fixed at the lower end of the support frame, and the motor is fixed at the lower end of the lower end plate; the bearing is fixed to the inner wall of the support frame, and the gear ring is fixed to the inner wall of the bearing; the driving plate is fixed to a shaft of a first motor, and the first connecting shaft is fixed to the upper end of the driving plate; the vertical shaft is fixed to the upper end of the lower end plate; the connecting plate is fixed to the outer wall of the vertical shaft, and the driving wheel is fixed at the lower end of the connecting plate; and the elastic dummy wafer is fixed to the lower end plate. The driving device has the advantages of being simple in structural design, being simple to use and the like, realizes the intermittent rotation of the brake disc, utilizes the elastic dummy wafer to realize the one-directional rotation of the device, ensures the smooth grinding of the brake disc, is high in automation degree, improves the grinding efficiency of the brake disc and saves labor and materials.