The invention discloses a polishing device for bearing machining. The polishing device for bearing machining comprises an electric motor, a fixing block and a material suction fan. The electric motoris installed above a machining platform. A fixing plate is connected with the end of a motor shaft, through holes are formed in the edge of the fixing plate, and blocking screens are arranged on the inner sides of the through holes. Chain wheels are arranged at one end of the motor shaft in a sleeving mode. The fixing block is fixedly arranged at one end of a sleeve, and the other end of the sleeve is connected with an adjusting rod. A connecting rod is arranged at the end of the adjusting rod, and connecting plates are installed on the edge side of the connecting rod. A sleeving block is arranged at the other end of the motor shaft in a sleeving mode, and the bottom of the sleeving block is connected with one end of a connecting pipe. By the adoption of the polishing device for bearing machining, bearing rings with different internal diameters are conveniently fixed, the fixed bearing rings have the quite high stability, and the phenomenon that the bearing rings bear the resistance todrop down is avoided. Meanwhile, the dust can be collected when polishing is conducted, and then the spread of the dust in the air is reduced.