Lightning arrester leakage current on-line monitoring device

The utility model discloses a lightning arrester leakage current on-line monitoring device, comprising an A-phase current detection module, a B-phase current detection module, a C-phase current detection module, an A-phase amplification circuit, a B-phase amplification circuit, a C-phase amplification circuit, a microprocessor, a display module, an interface module, a power supply module, and a lightning stroke counting circuit. The lightning arrester leakage current on-line monitoring device is capable of monitoring total leakage current of a lightning arrester in real time and monitoring data is accurate and reliable so that the performance state of the lightning arrester can be known in real time; and simultaneously, the monitoring situation of the leakage current is uploaded and an alarm is sent timely when an abnormality is discovered, so that the operation reliability of a power transmission line is increased and the safe operation of the power transmission line is guaranteed.