Safety rope for lowering persons from building with self-braking protective device

The utility model belongs to a safe protector for rescuing people to lower places from high-rise buildings or objects similar to the high-rise buildings. The motor of the safe protector drives a drum wound with a safety rope to rotate through a worm-wheel worm reducer. Because the safe protector can realize four-stage brake control comprising the direct-current braking of the motor, the self locking of the reducer, the closing of a normally-opened brake and the power-off closing of a normally-closed brake, the utility model can ensure the personal safety of persons joining training and eliminate the persons' injuring, disabling and dying accidents caused by improper safety protection.