The invention relates to the technical field of electric power, and discloses a cable high-precision temperature measuring device for solving the problems of poor fitness and single detection, and thedevice comprises a shell, and the interior of the shell is movably connected with a seat stand. Through the combined action of a seat stand, a temperature sensor, a rotating block, an ejector rod, aclamping rod, a rotating column and a rotating assembly, a to-be-detected part of a cable is automatically extruded and fixed, so that the to-be-detected part is tightly attached to the temperature sensor at the bottom, and the situation that the accuracy of detection data is low due to bending of the cable or shaking in the detection process is avoided; the performance of the temperature sensor can be exerted more stably, the temperature measurement effect is better, the position of the temperature sensor is automatically adjusted, the temperature sensor is transferred to a detection place after detection of one place, detection of multiple places of a cable is achieved, it is avoided that detection data have large errors due to the fact that a detection area is single, the temperature measurement accuracy is further improved. And higher actual measurement and calculation requirements are met.