Packaging box

A packaging box comprises a box body and two surrounding edges, and the box body is in a cuboid shape formed by folding a first paperboard blank and provided with openings in the two sides. Each surrounding edge is formed by folding a second paperboard blank body and comprises an inner side panel, an outer side panel, a pair of connecting sheets and an inner bottom sheet; the inner side panel is connected above the outer side panel, two second folding lines which are transversely arranged at intervals are arranged on the adjacent part of the inner side panel and the outer side panel, so that the inner side panel and the outer side panel form an edge with a certain width after being folded in half, and the width of the edge is equal to the distance between the two second folding lines; the connecting pieces are connected to the two transverse ends of the outer side panel through a third folding line in the vertical direction, the connecting pieces are bonded to the inner surfaces of the front wall and the rear