A device for coupling towed agricultural machines comprising means for fastening to a frame of the machine, a connecting arm extending substantially longitudinally away from the frame of the agricultural machine, and a coupling head comprising coupling means. The coupling head allows said connecting arm to rotate relative to the towing means about a first axis of rotation which is substantially perpendicular to an operating surface of the agricultural machine. The connecting arm is rotatably connected to the fastening means about a second axis of rotation, and further comprises reversible means for locking the rotation of the connecting arm.
