Printing roller of packaging printing machine

The utility model relates to the technical field of printing machines, in particular to a printing roller of a packaging printing machine, which adjusts the pressure between the printing roller and a lower feeding roller through a driving device and has certain adaptability to printing rollers with different diameters. The position of the printing roller is quickly adjusted through the adjusting device, so that the practicability of the device is improved; the protection device is matched with the driving device to protect the printing roller which stops working, the printing roller does not need to be disassembled, meanwhile, pollution caused by external dust to the surface of the printing roller after long-term storage is reduced, the practicability of the device is improved, and the labor intensity of operators is reduced. Comprising a driving device, an adjusting device and a protection device, the adjusting device is installed on the driving device, and the protection device is installed on the driving d