The utility model discloses a suspended vehicle-weighing lifting device which is arranged in a drum-type automobile detecting system which comprises a lifting plate, a lifting cylinder, a lifting guide rail, a guide slot, a pressure sensor, a double-head suspension arm screw rod, a guide frame, a guide post and a weighing bottom plate. The device of the utility model is lower in height and can decrease the height of a test bench, thus the maintenance is convenient; the number of sensors is small, so the manufacturing cost is low, the structure is simple, and the working reliability is high.