The invention discloses a packaging box. The packaging box comprises a base, a supporting unit and a locking unit, universal wheels are arranged at four corners of the lower end of the base, the supporting unit is installed at the upper end of the base, and the locking unit is arranged at the upper end of the supporting unit. The packaging box can solve the problems that first, when a common packaging box is produced and manufactured, boards are mostly fixed through a pneumatic nail gun, the packaging box needs to be repeatedly opened and closed in the using process, the boards are prone to being damaged through a nail gun fixing mode for a long time, the fixing effect is affected, and when the boards are fixed through the nail gun, potential safety hazards are prone to being caused to workers; and secondly, in the manufacturing process of existing packaging boxes, most of the packaging boxes are fixed through the nail gun, the packaging boxes shake in the transportation process, nails at connecting positions of boards are prone to falling off, the boards are loosened, the stability is lacked, and the using effect is affected.