The utility model relates to a packing box binding device which comprises a binding
machine, a first roller is arranged on the binding
machine, a placing table and a second roller are arranged on the surface of the binding
machine, a plurality of inserting grooves and a sliding
assembly are formed in the surface of the first roller in a penetrating mode, the sliding
assembly comprises a plurality of sliding rods, and the sliding rods are inserted into the inserting grooves respectively. A plurality of sliding rods are arranged in the first roller, a protruding block is arranged between one ends of the sliding rods, a
metal ring is arranged between the other ends of the sliding rods, and a protruding plate is arranged on the surface of the
metal ring. The inserting groove is formed in the first roller, and the sliding
assembly is arranged on the first roller through the inserting groove, so that the effect of guiding the inner layer of the packaging box can be achieved through the protruding block of the sliding assembly; the inner layer of the packaging box can be conveniently connected with the first roller, the
metal ring and the protruding plate which can be adjusted in a sliding mode can be used for pushing the packaging box subjected to edge rolling, the packaging box subjected to edge rolling treatment can be better separated from the first roller to be taken down, and a worker can more conveniently disassemble and assemble the packaging box and the first roller.