The utility model relates to a hang power hoisting device behind tractor, including middle splint and curb plate, the curb plate sets up two, and fixed connection constitutes the joint groove in the both sides of middle splint between two curb plates respectively, the rear end of middle splint is provided with hoisting device and promotes the hole, is provided with fixed orifices and lower spacing hole on the curb plate, and hoisting device promoted before the hole on the fixed orifices lay in middle splint, joint groove joint in the both sides of lower link between two curb plates, the lower terminal surface of middle splint draws close with the up end of lower link, fixed orifices on the curb plate promotes the connecting hole with the lower link of lower link intermediate position setting and connects through round pin major structure one -tenth hinge, and the lower spacing downthehole grafting of two curb plates has the round pin axle, and the face of cylinder of round pin axle and the lower terminal surface of lower link draw close, the hoisting device promotion hole of middle splint connects with the terminal constitution hinge of lift bar.