City rail U type liangmen hoist device, including the gantry crane, install first quiet pulley, symmetric distribution on its crossbeam at quiet pulley of the second of first quiet pulley both sides and the quiet pulley of third to and lie in a winding?mechanism and the 2nd winding?mechanism of the quiet pulley of second and the quiet pulley of third top, gantry crane crossbeam below is hanging the hinge through wire rope has quiet pulley of fourth and the 5th quiet pulley horizontally connect spare, according to the principle of laborsaving assembly pulley, after wire rope draws from a winding?mechanism, around quiet pulley of second and a plurality of circles of the quiet pulley of fourth back, behind first quiet pulley, link to the 2nd winding?mechanism behind the 5th quiet pulley and a plurality of circles of the quiet pulley of third again, there is the hoist and mount piece horizontally connect spare bottom hinge respectively. The utility model discloses simple structure, low cost, convenient to use is suitable for the rail U type roof beam hoist and mount of polytype city, need not to be equipped with many sets of hoists, has reduced and has changed manpower, the material resources that different hoist was spent, has improved work efficiency.