A demountable box pallet comprising on the one hand a pallet consisting of a square or rectangular floor and a support assembly comprising at least two rigid supports which are elongated and straight in shape, such as chevrons or similar, parallel to one another and on two opposing sides of the floor and each having a flat longitudinal support face (11 a) supporting the latter, wherein two supports, called end supports, extend along two opposing sides of the floor respectively, and on the other hand a polygonal, square or rectangular box, comprising four square or rectangular, solid or slatted walls (20, 21), forming the four lateral sides of the box, each bounded by two first opposing edges, a lower edge and an upper edge respectively, and two second opposing edges perpendicular to the latter, namely two first walls opposing and perpendicular to the end supports and two second walls, opposing and perpendicular to the latter, arranged on or close to the perimeter of the floor and perpendicularly to the latter, wherein each first wall and/or each second wall comprise at least one pin, called the lower pin, or some other male engagement element such as a trunnion nut, extending beyond the first lower edge of the corresponding wall, at least two supports, each comprising at least one engaging hole (11 b), called the lower hole (11 b), made in its support face (11 a), wherein the box pallet also comprises a means of belting in order to carry out the final assembly and, possibly, means of connection between two adjacent walls (20, 21), the box pallet being characterised in that: - the sides of the floor are recessed at the level of each hole (11 b), wherein each pin is inserted directly in one of said holes (11 b) and, if applicable, at least one of the boards of the floor is shorter than the other boards in order to be offset from the hole or holes (11 b) located level with it in the axis of the latter, wherein the floor partially covers the support face (11 a) of each end support and/or, if applicable, of the or each intermediate support, - the first lower edge of each wall (20, 21) rests directly on the corresponding support face (11 a) not covered by the floor, - each end support also comprises an engagement groove made longitudinally in the support face, preferably by cutting, if applicable, the or each engagement hole (11 b), - the first lower edge of each second wall, arranged along the relevant end support is inserted in the groove of the relevant support. - the sides of the floor are recessed at the level of each hole (11 b), wherein each pin is inserted directly in one of said holes (11 b) and, if applicable, at least one of the boards of the floor is shorter than the other boards in order to be offset from the hole or holes (11 b) located level with it in the axis of the latter, wherein the floor partially covers the support face (11 a) of each end support and/or, if applicable, of the or each intermediate support, - the first lower edge of each wall (20, 21) rests directly on the corresponding support face (11 a) not covered by the floor, - each end support also comprises an engagement groove made longitudinally in the support face, preferably by cutting, if applicable, the or each engagement hole (11 b), - the first lower edge of each second wall, arranged along the relevant end support is inserted in the groove of the relevant support.