Abstract: A demountable hitching device for towing by vehicles, by means of an angled arm (6, 6?) with a horizontal section (17) for its coupling and a vertical section ending in an upper ball (7, 7?), including a baseplate or support (8, 8?) wherefrom a rod emerges vertically (9) or horizontally (16) for its coupling to a bush (1, 1?) of a cubic shape and with one open side, inferiorly or frontally, respectively. The device features a locking slide (15), displaceable along the rod (9) emerging from the baseplate (8) and guided by a longitudinal channel. In an alternative version, the locking means consists of a pin constituted by a ring (21) which is adjustable to the rod (9?) of the baseplate (8?); for this purpose, the rod (9?) presents a flat side with transversal grooves (20), and in a diametrically opposite position, a longitudinal groove (25) to house a lug (24) projecting inwards from a lateral wall (23) of the pin.