Dust removal device of printing machine

The utility model relates to the field of printing machines, and discloses a printing machine dust removal device which comprises a dust collector and two supporting frames distributed on the left side and the right side, a plurality of conveying rollers are rotationally connected between the opposite side walls of the two supporting frames, the right ends of the conveying rollers are fixedly connected with synchronous wheels, and the synchronous wheels are located on the right side of the right supporting frame. A synchronous belt is connected between the outer walls of the synchronous wheels in a sleeved mode, a motor is fixedly connected to the left side wall of the left supporting frame, an output shaft of the motor is fixedly connected with the left end of one conveying roller, and an upper fixing pipe and a lower fixing pipe are fixedly connected to the tops and the bottoms of the two supporting frames correspondingly. The motor drives the conveying rollers to rotate, the conveying rollers between the t