The dust-laden gas enters the bag filter from the air inlet, and is filtered by the outer surface of the filter bag. The purified gas flows from the inside of the filter bag to the upper chambers, and is discharged from the air outlet through the long venturi tube. When the dust adsorbed on the outer surface of the filter bag reaches a certain value, it is controlled by the program to perform pulse injection at regular intervals, that is, when the high-pressure air is sprayed to the long venturi tube, the purified gas is blown back into the filter bag to form The large pressure difference sweeps the dust down to achieve the purpose of dust removal, and keeps the resistance of the entire equipment and system stable. The dust blown back falls to the bottom of the lower box and is discharged and recovered by the screw conveyor. The air box type pulse dust collector adopts the box-type dust removal. When cleaning the dust, it is isolated and rotated box by box. The pulse injection width and dust cleaning period of each dust collection chamber are automatically and continuously carried out by the dust removal program controller, thus ensuring the extension to the main inlet pipe. The incoming dust-laden flue gas directly enters the enlarged ash hopper to achieve the effect of pre-dust collection, and the horizontal straight pipe that is prone to blockage can be removed.