Double-sided printing device for packaging box

The utility model discloses a double-sided printing device for packing boxes, and relates to the technical field of double-sided printing devices for packing boxes, the double-sided printing device comprises a support body and a printing assembly, the support body is composed of a bottom frame, an outer support and a fixing plate, and a conveying assembly and a limiting assembly are distributed on the two sides of the outer wall of the fixing plate. Automatic conveying operation of packaging box paper shells with different thicknesses can be achieved through the conveying assembly, synchronous double-face printing operation can be conducted on the upper faces and the lower faces of the packaging box paper shells through the printing assembly, and the conveyed packaging box paper shells can be limited through the limiting assembly; the position of the packaging box paper shell is located at the symmetrical center position of the upper printing mold and the lower printing mold, so that the upper printing mold a