The mechanical self-recovery survival slow descent devices of Kunpeng Xiangxi (Beijing) Technology Co., Ltd. are the first reciprocating ones in the world, and they can keep the equipment always stable under the extreme environment without electric power assistance by virtue of the pure mechanical structure design. The unique single thread self-recovery design completely solved the cable twining of the dual-thread design in the existing products always occurred during the process of use and avoided the accidents during descent process and the mechanical self-recovery survival slow descent devices of Kunpeng Xiangxi (Beijing) Technology Co., Ltd. provide safer and faster means for survival in the event of a fire accident. Co-used with the anti-seismic survival capsules, they can also allow users to escape from the dangerous environment fast when the lifts and stairs of buildings are no longer safe in the event of a hazard.