The utility model discloses a protection device of a goaf coal spontaneous combustion distributed temperature measurement fiber. The device comprises a steel tube and a spring. The inner diameter of the spring is not smaller than the external diameter of the steel tube. The end part of the spring sleeves the outer side of the end part of the steel tube and the spring communicates with the steel tube. The thermal conductivity of the steel tube is good, a redundant disk is conveniently arranged in the tube, and the fiber is reserved. The spring has good thermal conductivity performance and good flexibility, the device can be arranged in a bending and coiling way at special positions such as working surface upper and lower corner, the back part of a support, a stopping line support withdrawn frame and a closed wall, and the temperature measurement fiber is protected.