Additional device for bag-type dust collector

The utility model discloses an additional device for a bag-type dust collector. The additional device comprises an adsorption box and a dust collection pipe communicated with the bag-type dust collector, wherein the adsorption box (8) is made into a totally closed box body and is communicated with the outlet of an induced draft fan (2) of the bag-type dust collector (1) by virtue of the dust collection pipe (4); the adsorption box is filled with dust collection water (10) close to the outlet of the dust collection pipe (4); at least one air outlet pipe (7) is installed on and connected to a top cover of the adsorption box (8); a dust collection cloth bag (6) is arranged at the outlet of each air outlet pipe (7) in a sleeving manner; and a water inlet pipe (9) controlled by a valve is installed on and connected to the side wall of the adsorption box (8). A small amount of remaining dust generated after treatment of the bag-type dust collector is collected in the adsorption box 8, is absorbed by water and is discharged at regular time. Therefore, the problem that an indoor space is subjected to secondary pollution of dust produced by the bag-type dust collector is solved, clean indoor air of a manufacturing shop is guaranteed, and the problem that the body health of workers is injured is avoided.