The utility model provides a pneumatic rust cleaning system, include: pneumatic deruster body, rust cleaning portion, the extension bar, first trachea and gas pipe fittings, rust cleaning portion is connected to the first end of pneumatic deruster body, first tracheal first end is connected with gas input port on the pneumatic deruster body, the extension rod cover is located outside the first trachea, and the first end of extension bar is connected with the second of pneumatic deruster body end, the extension bar is used for making pneumatic deruster body and rust cleaning portion to stretchinto the screw rod bottom end rust cleaning, first tracheal second end stretches out the second end of extension bar, the logical air through tube connecting piece of first tracheal second end can bedismantled with the tracheal first end of second and be connected, the tracheal second of second end is connected with the gas outlet end that gas was stood, can make pneumatic deruster body and rustcleaning portion stretch into the screw rod bottom end rust cleaning on the one hand, on the other hand, operator person can grip the extension bar operation, the injury of the iron rust having avoided the high -speed rotatory rust cleaning portion of rust cleaning in -process and flown away from, the operation security has improved.