The utility model belongs to the field of packaging products, and provides a
high polymer material packaging box with good durability, which comprises a base, a bottom plate, side plates, a top plate and a supporting
assembly. Wherein the bottom plate is transversely arranged on the base; the side plates are perpendicular to the bottom plate, surround the bottom plate and are all connected to the base. The top plate is connected to the side plate, is parallel to and opposite to the bottom plate at intervals, and cooperates with the side plate and the bottom plate to form an accommodating cavity; the supporting
assembly comprises a first supporting strip and a second supporting strip which are located in the containing cavity and connected to the side plates respectively, the first supporting strip and the second supporting strip are both bending-resistant
high polymer material bodies, the first supporting strip perpendicularly penetrates through the bottom plate and is connected to the base, and the second supporting strip is parallel to the top plate and is connected to the included angle between the side plates and the top plate.