Printing machine waste gas treatment device

The utility model relates to the technical field of printing machines, in particular to a printing machine waste gas treatment device which comprises a box body, a filter box is fixedly installed on the edge portion of the top end of the box body, a filter cavity is formed in the filter box, fixing frames are symmetrically welded to the edge portions of the two sides of the inner wall of the filter cavity, and a supporting frame is movably installed between the two fixing frames arranged in a bilateral symmetry mode. A filtering frame is mounted on the upper surface of the supporting frame, a filtering layer is placed in the filtering frame, a limiting frame is fixedly connected to the middle of the bottom end of the filtering frame and located in the containing groove, and a limiting screw rod is in threaded connection with the position, extending into the limiting frame, of the middle of the top end of the filtering frame. According to the utility model, the movable filter frame is limited through the suppo