The invention discloses a metal rod piece packaging box which is of a cube or cuboid structure. At least two opposite edges in four edges of an upper cover face and at least two opposite edges in four edges of a lower bottom face are main body rod pieces, the left lateral edges and the right lateral edges of the main body rod pieces are correspondingly provided with a plurality of outwards-inclined buttonholes, and an opening slot is formed between each outwards-inclined buttonhole and the corresponding main body rod piece; the two ends of upper cover reinforcing rods and the two ends of vertical reinforcing rods are all connected with connector rod pieces and are connected with the main body rod pieces by matching the connector rod pieces with the main body rod pieces. When the connector rod pieces are connected with the main body rod pieces, the outwards-inclined buttonholes in the two lateral edges of the rod pieces on the inner side are embedded into the opening slots in the two lateral edges of the rod pieces on the outer side correspondingly for connection. By means of the metal rod piece packaging box, the fabrication process is greatly simplified, welding is basically not needed, connection through bolts and nuts is also not needed, labor hours and auxiliary materials are reduced, and the cost of the packaging box can be lowered; the overall strength and rigidity are far superior to that of a wood or plastic packaging box, and the metal rod piece packaging box is suitable for long-distance transport; and the overall packaging box can be detached conveniently and rapidly, and the packaging box can be recycled for repeated use.