The utility model discloses a lifesaving device for high-rise buildings, particularly a circular power-free and fresh air self-feeding lifesaving device for high-rise buildings. The utility model comprises a frame body (1), a chain wheel group (2), a plurality of carriers (3), a slow gear box (4), a slow windmill (5), a generator set (6), etc., wherein, the frame body is vertically and fixedly arranged on the external walls, or the inner escape passages or the wall surfaces of a building, which causes the carriers (3) connected with a chain (23) of chain wheel groups (21, 22) to be horizontally moved in the descent process for escapers to hitch; the fresh air is supplied by the slow windmill and the generator set is started to supply the lighting and the electric power of alarms on each floor.