Side pattern printing device for paper-plastic packaging box production

The invention relates to the field of paper-plastic packaging box printing devices, in particular to a side pattern printing device for paper-plastic packaging box production, which comprises a rack, a paper-plastic packaging box, a first conveyor and a printing device, pressing assemblies are further arranged on two sides of the printing device on the rack, and each pressing assembly comprises a first support and a rotating roll shaft; and a first motor, a first ring sleeve and a sliding abutting mechanism. A first motor starts to work, the first motor drives a rotating roller shaft to rotate, and the rotating roller shaft can drive a first ring sleeve arranged on the rotating roller shaft to rotate together, so that a plurality of first sliding rods drive a sliding abutting mechanism arranged on the first sliding rods to do circular motion, and an abutting plate on the abutting mechanism can be inserted into a paper-plastic packaging box; and the abutting plate is attached to the inner wall of the paper-pla