Provided is a bag filter bag filter device that can solve the problem that the dust is accumulated in the inner wall of the device is not recovered. The bag filter bag filter device according to the present invention is a bag filter bag filter device using a bag filter that collects dust and the like from the supplied polluted air and discharges it to the outside, a plurality of bag filters for filtering the dust is installed in the vertical direction Upright cylindrical upper case; A lower case which is formed at a lower end of the upper case and collects dust falling from the bag filter and becomes smaller in area toward a lower portion thereof; And two or more air supply pipes penetrating the lower case to supply contaminated air into the bag filter bag filter, and the air supply pipes are alternately installed on opposite sides of the lower case, and the air supply pipe side is provided. In the side discharge hole is formed, the air flow between the two or more air supply pipe is rotated along the inner circumference of the lower case and the central space between the two or more air supply pipe is to form an area where dust can fall. .
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