Abstract: This device for lifting the pole of a trailer of the semi-carried type and coupling same to a tractor vehicle comprises a supporting bracket secured beneath and at the rear of the tractor in alignment with the center line thereof, a lever having a hook portion adapted to pick up the shackle of the trailer pole and a crosshead-shaped opposite end, this lever being pivoted to said bracket about a horizontal axis in order to move said hook portion by means of a hydraulic actuator from a low, shackle picking-up position to a high coupling and hauling position in which said lever is locked by a safety system releasable by manual, electric or electromagnetic, or hydraulic means.