Abstract: The present reusable packaging box having the shape of a rectangular parallelepiped includes four lateral walls (1, 2, 3, 4) joined together in such a manner that the lateral periphery of the box is closed, as well as two cover parts (5, 6) and bottom parts (7, 8), all substantially rectangular, forming each one an edge with a respective lateral wall and having a free border parallel to this edge. The free borders (5a, 6a) of the two cover and bottom parts include each one a profile of which the cross-section and the construction are such that these free borders can be joined together by the mutual engagement of these profiles.