Palletizing device of container packs, being of a sliding table type, comprising - a structure, the structure comprising mobile frames motorized along said structure, - a loading surface of the container packs, - the structure supporting the loading surface, - the loading surface comprising side-by-side parallel rollers, two ends of the rollers being mounted on the frames according to a freely rotation, - the loading surface further comprising two side parts, made of the rollers, - the two side parts being movable along a stroke into opposite directions from a closed position to an opened position, and reversely, thanks to the movement of the mobile frames along the structure, characterized in that the structure further comprises: - a locking system of at least one of the rollers of each of the two side parts, - the locking system comprising, i) a locking means with a cart jointly mobile with the frames, the locking means comprising a locker, the locker being supported by the cart and being mobile from a folded position to an unfolded position, and reversely, in the unfolded position, the locker being in contact with the at least one of the rollers and blocking the freely rotation, and in that the locking system further comprising ii) a locking actuator, mounted fixed on the structure, along the stroke of the two side parts, the locking means cooperating with the locking actuator to move the locker from the folded position to the unfolded position to lock the at least one of the rollers of the two sides parts during the movement of the corresponding of the two side parts from the closed to the opened position. - a structure, the structure comprising mobile frames motorized along said structure, - a loading surface of the container packs, - the structure supporting the loading surface, - the loading surface comprising side-by-side parallel rollers, two ends of the rollers being mounted on the frames according to a freely rotation, - the loading surface further comprising two side parts, made of the rollers, - the two side parts being movable along a stroke into opposite directions from a closed position to an opened position, and reversely, thanks to the movement of the mobile frames along the structure, characterized in that the structure further comprises: - a locking system of at least one of the rollers of each of the two side parts, - the locking system comprising, i) a locking means with a cart jointly mobile with the frames, the locking means comprising a locker, the locker being supported by the cart and being mobile from a folded position to an unfolded position, and reversely, in the unfolded position, the locker being in contact with the at least one of the rollers and blocking the freely rotation, and in that the locking system further comprising ii) a locking actuator, mounted fixed on the structure, along the stroke of the two side parts, the locking means cooperating with the locking actuator to move the locker from the folded position to the unfolded position to lock the at least one of the rollers of the two sides parts during the movement of the corresponding of the two side parts from the closed to the opened position. - a locking system of at least one of the rollers of each of the two side parts, - the locking system comprising, i) a locking means with a cart jointly mobile with the frames, the locking means comprising a locker, the locker being supported by the cart and being mobile from a folded position to an unfolded position, and reversely, in the unfolded position, the locker being in contact with the at least one of the rollers and blocking the freely rotation, and in that the locking system further comprising ii) a locking actuator, mounted fixed on the structure, along the stroke of the two side parts, the locking means cooperating with the locking actuator to move the locker from the folded position to the unfolded position to lock the at least one of the rollers of the two sides parts during the movement of the corresponding of the two side parts from the closed to the opened position. i) a locking means with a cart jointly mobile with the frames, the locking means comprising a locker, the locker being supported by the cart and being mobile from a folded position to an unfolded position, and reversely, in the unfolded position, the locker being in contact with the at least one of the rollers and blocking the freely rotation, and in that the locking system further comprising the locking means comprising a locker, the locker being supported by the cart and being mobile from a folded position to an unfolded position, and reversely, in the unfolded position, the locker being in contact with the at least one of the rollers and blocking the freely rotation, and in that the locking system further comprising ii) a locking actuator, mounted fixed on the structure, along the stroke of the two side parts, the locking means cooperating with the locking actuator to move the locker from the folded position to the unfolded position to lock the at least one of the rollers of the two sides parts during the movement of the corresponding of the two side parts from the closed to the opened position.