Phase change material packaging box

The utility model relates to a phase change material packaging box which comprises a box body, a plurality of micro-capsules are arranged in the box body, phase change materials are filled in the micro-capsules, heat conduction liquid is filled among the micro-capsules in the box body, the top of the box body is connected with a sealing plate in a sliding mode, a cylinder barrel is fixedly connected in the sealing plate, a piston is connected in the cylinder barrel in a sliding mode, and an air bag is arranged at the bottom of the piston. Through the design of the piston, the cylinder barrel, the air bag and other elements, the equipment can be self-adjusted according to the internal pressure change, leakage caused by the volume change is prevented, the design of the warning piece and the magnet also provides a visual pressure monitoring mode, when the internal pressure is too large, the warning piece can be pushed away, an obvious warning is provided for a user, and the safety of the equipment is improved. T