The embodiment of the invention discloses a garage lifting transmission system, and refers to the field of garage. The garage lifting transmission system includes a outer frame, a lifting motor, a dynamic conversing device, main hauling ropes, lifting hauling rope groups, rope fixing seats, rope fixing rod groups, a first pulley group, a second pulley group, a third pulley group and lifting pulleygroup. One rope of the main hauling ropes is connected with a plurality of carrier frames through movable pulleys and the lifting hauling rope groups, so that the carrier frames can be hauled to liftor hoist only need one lifting motor, without the need that chains are arranged on transmission shaft sprocket wheels of the lifting motor, or wireropes are arranged on mounting reels and each carrier frames is equipped with a lifting motor. Transmission chains of lifting transversely-moving garage transmission system are shortened, the garage lifting transmission system is easy to install, and the cost of production is reduced.