Dust collecting auxiliary device

The utility model discloses a dust collecting auxiliary device which is matched with an outlet of a ventilating pipe of a central dust collector. The auxiliary device comprises a barrel which is arranged below the outlet of the ventilating pipe of the central dust collector. The upper side of the barrel body is opened to form a barrel opening. The size of the barrel opening is matched with that of the outlet of the ventilating pipe of the central dust collector. A collecting bag for collecting dust is sleeved with the barrel body freely and is detachably connected with the barrel opening in an interference fit mode. A vibration piece for vibrating the barrel body is arranged on the barrel body. The auxiliary device is simple in structure, convenient and rapid to operate, and capable of saving labor cost, rapidly and effectively collecting duct, improving the production efficiency and solving the environment pollution problem.