Composite insulator leakage current online monitoring system and composite insulator detection device

The utility model relates to a composite insulator leakage current online monitoring system and a composite insulator detection device, in particular to an online monitoring system for composite insulator leakage current in a power grid transmission line, which comprises a signal processing module and a central processing module, wherein the signal processing module comprises an LED optical fiber current sensor and a noise reduction filtering amplification circuit; the LED optical fiber current sensor collects the leakage current of the detected insulator and then transmits a signal to the input end of the noise reduction filtering amplification circuit. The central processing module comprises a single-chip microcomputer, a serial port or USB module and an upper computer. The input end of the single-chip microcomputer is connected with the output end of the noise reduction filtering amplification circuit. The output port of the single-chip microcomputer is connected with an upper computer through a serial por