A partial discharge high-frequency monitor of high-voltage cable terminals comprises three partial discharge sensors, a partial discharge signal collecting and processing device and a power source. The partial discharge sensors are partial discharge signal sensors and are composed of high frequency wave sensors, and the three partial discharge sensors are mounted on the surface of an A phase cable terminal, the surface of a B phase cable terminal and the surface of a C phase cable terminal respectively and are connected with three signal collecting input ends of the partial discharge signal collecting and processing device respectively. According to the partial discharge high-frequency monitor of the high-voltage cable terminal, the high-frequency partial discharge sensors which are large in gain, wide in frequency band and high in sensitivity are used, a corresponding signal amplification circuit and a corresponding filter circuit are designed, a partial discharge high-frequency signal subsequent processing program is developed by the aid of an ARM, and display of the partial discharge signal discharge amplitude and release of alarm information are achieved. Meanwhile, a UPS is used for taking electricity on a load side, and partial discharge online monitoring, timely finding of insulation defects and real-time tracking of the cable terminals are finally achieved.