Device for connecting an agricultural accessory to an agricultural tractor vehicle, characterised in that it comprises: - a receiving part adapted to be attached to the agricultural accessory, the said part comprising a guide adapted for displacement of a coupling member attached to the agricultural tractor vehicle, an auxiliary groove and a projection - a pawl attached to the receiving part in an articulation, the said pawl comprising, at a first mobile end, a projection attached to a projection of the receiving part via an elastic member and, at a second mobile end, a receiving hook for receiving an end of the said coupling member, the said pawl being arranged, when at rest, in an intermediate position of the guide - a locking part articulated to the receiving part which has a recess for receiving an end of the pawl - a lock actuation part attached to the receiving part via an articulation provided with an elastic torsion member, the said lock actuation part comprising a groove at one end and a lever at a second end of the lock actuation part, the said second end being arranged opposite the first end in relation to the articulation - a connecting part that has an end articulated with respect to the locking part and an opposite end with a pin that runs in the said groove of the lock actuation part and in the auxiliary groove of the receiving part - an arming member attached to the receiving part in said articulation in which said pawl is attached to said receiving part, the said arming member having, in an area of its articulated travel with respect to the receiving part, a position of interference with the coupling member, the said interference position being in an area closer to the recess of the guide than the intermediate position of the guide in which the pawl sits when at rest wherein the displacement of the coupling member in the guide of the receiving part causes the raising and lowering of the pawl, so that the end of the coupling member is lodged in the hook of the pawl, wherein the elevation of the connecting device causes an inclination of the coupling member, which actuates the lever of the lock actuation part, causing an end of the pawl to engage in the said recess of the locking part, wherein a displacement of the coupling member up to the end of the guide causes the rotation of the pawl, which in turn actuates the arming member, causing the arrangement of the said interference position, and wherein the coupling member, in a displacement towards the exterior of the guide, interferes with the arming member and causes the return movement of the arming member, which in turn actuates the pawl via the projection of the pawl, causing it to return to its resting position. - a receiving part adapted to be attached to the agricultural accessory, the said part comprising a guide adapted for displacement of a coupling member attached to the agricultural tractor vehicle, an auxiliary groove and a projection - a pawl attached to the receiving part in an articulation, the said pawl comprising, at a first mobile end, a projection attached to a projection of the receiving part via an elastic member and, at a second mobile end, a receiving hook for receiving an end of the said coupling member, the said pawl being arranged, when at rest, in an intermediate position of the guide - a locking part articulated to the receiving part which has a recess for receiving an end of the pawl - a lock actuation part attached to the receiving part via an articulation provided with an elastic torsion member, the said lock actuation part comprising a groove at one end and a lever at a second end of the lock actuation part, the said second end being arranged opposite the first end in relation to the articulation - a connecting part that has an end articulated with respect to the locking part and an opposite end with a pin that runs in the said groove of the lock actuation part and in the auxiliary groove of the receiving part - an arming member attached to the receiving part in said articulation in which said pawl is attached to said receiving part, the said arming member having, in an area of its articulated travel with respect to the receiving part, a position of interference with the coupling member, the said interference position being in an area closer to the recess of the guide than the intermediate position of the guide in which the pawl sits when at rest