Circulating current detection of high-voltage cable metal sheath is an important technical detection work for the daily operation and maintenance of main network cable lines. The existing traditional mode of grounding circulation technology detection work mainly relies on manual measurement by operators with clamp-type ammeters and quarterly inspection cycles, which cannot effectively and real-time reflect the grounding circulation, and it is not convenient to maintain the health level of the main network cable line. monitor. Therefore, it is necessary to establish a system that is both anti-theft and real-time online monitoring to solve the current cable circulation, cable sheath voltage, cable temperature, and equipment safety issues in the current real-time operation of power cables. According to the above-mentioned current requirements, the intelligent high-voltage cable grounding box developed and produced by our company has a built-in high-voltage cable online monitoring system to monitor the status of grounding circulation and the insulation status of cable intermediate joints to ensure the safe operation of power cables.