The device (1) for the towing vehicle-trailer connection, comprises: a first male joint (2) inside which are provided first valve means (2a); a first female adapted to receive said first male joint (2); a second male joint (3) inside which are provided second valve means (3a) comprising a plugging element (25) housed in a sliding manner inside the second male joint (3) between a closed position and an open position; a brake-trailer valve (4) comprising a body (5) wherein at least one seat (6) inside which is housed in a sliding manner a distributor (10); piloting means (11) of the distributor (10) comprising at least a first and a second piloting element (11a, 11b) which are adapted to interact with the distributor (10); control means (12) operable by said second valve means (3a) and movable between a home position, wherein they allow the displacement of both the piloting elements (11a, 11b), and a work position, wherein they are adapted to lock the displacement of one of the piloting elements (11a, 11b), the second valve means (3a) comprising at least one thrust element (28) housed in a sliding manner inside the second male joint (3) and adapted to interact with the control means (12); where the thrust element (28) is movable in a sliding manner with respect to the plugging element (25) and has at least a first end (28a) facing outwardly of said second male joint (3) and a second end (28b), opposed to the first end (28a), able to interact with the control means (12).
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