Working principle: When the dust-containing gas enters from the inlet of the moving bag filter, the diversion pipe enters each unit room. Under the action of the flow guiding device, the large particle dust separates directly into the ash hopper, and the remaining dust uniformly enters with the airflow. The filter bag in each chamber filtration zone, when the dust-containing gas passes through the filter bag, the dust is adsorbed on the filter bag, and the purified gas is removed from the filter bag.