Roller cleaning device of printing machine

The utility model discloses a roller cleaning device of a printing machine, relates to the technical field of roller cleaning, solves the problem that a roller cannot be effectively fixed in the cleaning process, and comprises a cleaning box body, fixing mechanisms are arranged on the front portion and the rear portion of the cleaning box body, and each fixing mechanism comprises a fixing block. A sliding block groove is formed in one side of the fixing block, a sliding block is arranged in the sliding block groove in a sliding mode, matching blocks are arranged on the two sides of the sliding block, and clamping grooves are formed in the two sides of the inner wall of the sliding block groove; the sliding block moves upwards under the elastic acting force of the first spring, so that the shaft rod of the printing cylinder body is fixed, the printing cylinder body is effectively fixed, the printing cylinder body can rotate along with the first gear, and therefore the effect that the surface of the printing cy