The boiler bag filter is composed of dust bag components, flow guide devices, pulse injection systems, ash discharge systems, control systems, offline protection systems, and enclosures. The dusty gas enters each unit room through a guide pipe. Under the action of the guide device, the large particle dust is separated and directly falls into the ash hopper. The remaining dust enters the filtering area of each compartment uniformly with the airflow. The filtered clean gas passes through the filter bag and is discharged through the upper box, lift valve, and exhaust pipe. As the filtration process progresses, when the dust on the surface of the filter bag reaches the thickness, the cleaning control device (differential pressure or timed, manual control) closes the lift valve according to the set program, controls the current unit offline, and opens the electromagnetic pulse valve for spraying, shaking off the dust on the filter bag. The dust falling into the ash hopper is discharged through the ash discharge valve and sent out through the ash conveying system.