The invention discloses a gear grinding and polishing device. The gear grinding and polishing device comprises a frame and a hand wheel. A sand barrel is arranged in the middle of the frame. A first height adjusting hole is formed in the left side of the sand barrel. A second height adjusting hole is formed in the left side of the frame. A second height adjusting rod is embedded in the middle of the second height adjusting hole. The upper part of the first height adjusting rod and the upper part of the second height adjusting rod are connected by a fixing frame. A motor is fixed on the upper right side of the fixing frame. A rotating shaft is embedded in the middle of the fixing frame. Gear fixing clamps are arranged at the lower end of the rotating shaft. According to the gear grinding and polishing device, the sand barrel is arranged, a gear to be polished is put into carborundum and polished, and the surface of the gear is coated with the carborundum, so that the grinding of the gear is more uniform; and the grinding and polishing are carried out together, so that the complicated process of polishing by using a grinding machine first and then a polishing machine in a traditionaltechnology is avoided, the occupied area of mechanical equipment is reduced, and the cost of purchasing machines is saved.