This invention relates to the field of cable protection equipment technology, and discloses a self-releasing protection device and method for preventing damage to operating cables from external forces. It includes at least three fixed units spaced apart along a pre-laid cable
route, with adjacent fixed units located on opposite sides of the cable
route. All fixed units, or all fixed units on the same side of the cable
route, are movably connected to release units. The cable is sequentially connected to the fixed units or all release units connected to the fixed units along the pre-laid cable route. This invention, by setting multiple fixed units and release units, installs the cable, which was originally installed in a
linear configuration, into a bent or flexed state. When the cable is damaged by external forces, it can compensate for the potential damage and protect the cable, solving the problem in existing technologies that cannot effectively protect cables that may be pulled or damaged by external forces.