High-rise life saving device descending at constant speed

The utility model discloses a high-rise life saving device descending at the constant speed. A drum shaft (2) is arranged on a frame (1). Winding drums (5, 6) are respectively arranged on both sides of a large gear (7) on the drum shaft (2). The winding drums (5, 6) are wound by steel wire ropes (13, 14). A transmission shaft (3) with a pinion (8) is arranged at the lower part of the drum shaft (2) on the frame (1). The pinion (8) is meshed with the large gear (7). A gear shaft (4) is arranged at the lower part of the transmission shaft (3) on the frame (1). The gear shaft (4) is meshed with the pinion (8). Frictional disks (9, 10) are arranged at both ends of the gear shaft (4). Centrifugal disks (11, 12) are arranged at both ends of the gear shaft (4) in the frictional disks (9, 10). The centrifugal disks (11, 12) are respectively in movable contact with the frictional disks (9, 10). The life saving device helps people, particularly old people, women, children, disabled people and patients, to rapidly and s