Lightning arrester leakage current on-line monitoring device

The invention discloses a lightning arrester leakage current on-line monitoring device. A current detector is used for monitoring leakage current and action current when a lightning arrester works normally, is of a non-contact structure, acquires a current value, locally digitize the current value and then upload the current value to a network, so that a platform can monitor the working state of the lightning arrester in real time. Laser emitted by a laser device irradiates a reflector and is reflected to a calibrator on the bottom surface; when the laser is irradiated on the calibrator, afterthe laser is irradiated on the reflector, light emitted by a prism array illuminates a whole color sheet, and the color sheet is illuminated and then sends a signal to maintenance personnel (or a camera), at the moment, a lightning rod is in a vertical state, the position of the current detector is not displaced, and the working position of the current detector is normal; when the lightning rod is inclined or the current