The utility model provides a radial harmomegathus stop device of drum shoulder, including pull rod, dabber, drive mechanism and back back shaft, its characterized in that, the pull rod sets up in the dabber, the pull rod outer lane is equipped with a stair?structure, the dabber inner circle is equipped with a corresponding stair?structure, the pull rod terminal surface with be equipped with a location buffer block between the back back shaft. Through the setting of inside step of dabber and location buffer block, limited the stroke of pull rod motion, diameter size when just also having fixed a position the radial harmomegathus of bulging shoulder, high frequent impact force when the pressed rod back and forth movement can be held to this structure, intensity is high, and the location is accurate high, having guaranteed the use noodles eaten on one's birthday of the whole parts of drum that directly contract, reduces the maintenance cost.