Reciprocating type disaster lifesaving device

The invention discloses a reciprocating type disaster lifesaving device which comprises a mounting hanging bracket mounted at a high position and a steel rope winding and unwinding winch below the mounting hanging bracket, and the lower portion of the steel rope winding and unwinding winch is connected with two escape hanging baskets used for ascending and descending for escape through steel ropes; a floor height positioning device is arranged on the steel rope winding and unwinding winch, a centrifugal friction speed reduction device is coaxially arranged in the steel rope winding and unwinding winch, a human body self-weight automatic braking system is arranged in the escape hanging basket, and a steel rope in the escape hanging basket is arranged on the human body self-weight automatic braking system. The two escape hanging baskets alternately move up and down, reciprocating self-rescue and mutual-rescue escape is achieved, different floor heights are positioned through the floor height positioning device,