Abstract: In order to achieve the goal of management informationization and intelligence required by the smart grid, different types of cable terminal working status monitoring methods are compared and analyzed. Based on visible light, infrared thermal imaging, acoustic detection system, a power cable terminal state detection device based on infrared thermal imaging system is designed.The device can be powered by the device itself or by external power supply to realize 24-hour real-time detection of abnormal power cable. The data of real-time detection is stored in local system, and the closed-loop system is formed by data query, data analysis and report export with the professional power cable terminal state detection software. The collected data can also be analyzed in the background, and all the temperature information in the collected infrared thermography can be extracted, which can provide effective data support for the later power maintenance and achieve the goal of power cable terminal state monitoring.