Texas Dorset mechanical invention discloses a luffing crane machine, which includes the tower and lifting frame, characterized in that the material hoist tower site, the tower has a feed box on the lower side, the tower on the unit frame has a feeding device, discharging device comprises a hopper, then plate, hitting arm, pull the shaft and pull the handle material, material lifting equipment, including feeding device, drive sprocket, driven sprocket, drive chain, belt reducer lift motors and controllers, feed device includes a positioning plate, positioning the roll holder, hopper and a return spring, the drive sprocket and the driven sprocket fixed to the body in the tower with the positioning plate on the drive chain, respectively, the lower end of the positioning plate has registration roller stand, hoppers roll carts sitting position, both ends by the return spring is connected with the positioning plate, then top with a hopper feed plate, top with a hopper inlet shaft pull, pull the shaft has a touch bucket pole, tower cranes luffing mechanism, pull one end of the shaft has a pull handle material, crane luffing mechanism, high efficiency, fast construction schedule, cost, safety, crane luffing mechanism, which can multi-floor construction.