The utility model discloses a repeatedly usable's a motor stator rotor air gap protector, including enclosing synthetic cylindrical structures's gasbag by the head and the tail overlap joint, the gasbag is scalable, and one of which side axial is equipped with many auxiliary air bag, appearance after auxiliary air bag aerifys with send out the motor stator rotor air gap and coincide, still be equipped with the pneumatic valve on the gasbag, the utility model discloses making and deciding the rotor air gap and can fill up completely and do not keep the gap, device surfacing, the foreign matterthat is favorable to the discovery to be dropped have prevented the foreign matter to drop to decide the possibility of rotor air gap, do benefit to the steady operation of equipment completely.