The application belongs to the technical field of printing machines, in particular to an ink
transmission system of a printing unit of a rotary printing
machine, which comprises a supporting table, a suction plate fixedly connected to the shaft center of the top surface of the supporting table, running boxes fixedly connected to the two sides of the top of the supporting table, air-
drying plates fixedly connected to the top of the inner wall of the running box, a transport rotating rod rotationally connected to the middle of the inner cavity of the running box, conductive rods fixedly connected to the two sides of the lower surface of the supporting table, printing components, and control components arranged at the two ends of the printing components. The printing rotary wheel of the device is designed in a
layered structure. After ensuring that the printing rotary wheel can perform printing work through the added ink in the inner cavity, the matching rotary disc can relatively rotate with the printing rotary wheel, so as to continuously shake the ink and stir the ink through the composite connecting plate, so that the ink dyed on the outer surface of the printing rotary wheel is not prone to
color difference due to layering.