Printing roller of printing machine

The utility model relates to the technical field of printing machines, and discloses a printing roller of a printing machine, which comprises a main body mechanism and a heat dissipation mechanism, the heat dissipation mechanism is positioned on the rear side of the main body mechanism, the main body mechanism comprises a fixed bottom plate, a mounting plate and a connecting rod, and the mounting plate is fixedly mounted at the upper end of the fixed bottom plate; the connecting rod is located in the middle of the mounting plate, the main body mechanism further comprises a mounting assembly, a printing roller body and a first transmission motor, and the mounting assembly is located on the upper side of the fixed bottom plate. According to the printing roller of the printing machine, by installing the main body mechanism, a worker can enable a plurality of vacuum suction heads to be adsorbed on the right surface of the printing roller body through cooperation of a vacuum generator, a vacuum generation head and