Printing roller cooling device for printing machinery

The utility model relates to a printing roller cooling device for printing machinery. The printer comprises a printer body, a printing roller body and a cooling assembly. The printing roller body comprises a printing ring and a covering plate. The covering plates cover the side faces of the two sides of the printing ring. The cooling coil is pressed in the printing ring by the covering plate; positioning holes are formed in the two covering plates; the positioning hole and the printing ring are coaxially arranged; the cooling assembly comprises a cooling coil pipe, two mounting pipes and a cooling box; the cooling box, the mounting pipe and the cooling coil are all filled with cooling liquid, the cooling coil and the printing ring are fixed, connecting pipes extending out of the positioning holes are arranged on the two sides of the cooling coil, the connecting pipes are rotationally connected with the mounting pipe, and the side walls of the connecting pipes are attached to the side walls of the positioning