Abstract: A temperature measurement and early warning device is developed, consisting of three parts: signal temperature processing system, signal monitoring and early warning system and power management system, It is installed at the indirect head (terminal head) in important cable to measure the temperature of the indirect head (terminal head) in the cable in real time, realize 24-hour real-time visualization, fully transparent digital monitoring and early warning, timely detect circuit equipment defects, and ensure the safe and reliable operation of the cable.