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 to collect dust and the like from the supplied polluted air and discharge it to the outside, a plurality of bag filters for filtering the dust is installed in the vertical direction Upper case; A lower case formed at a lower end of the upper case and collecting dust falling from the bag filter; And two or more parallel air supply pipes penetrating the lower case to supply contaminated air into the bag filter bag filter, and an air jet is formed on a side inner wall of the upper case or the lower case. The side discharge holes are formed to face each other, and the central space between the two or more air supply pipes forms an area where dust can fall.
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