The utility model discloses a from triggering formula power transmission line insulator pollution flashover early warning device, including leakage current sensor, device main part, the leakage current sensor pass through the buckle with the device body is connected, device main part low pass filter, rectifier circuit, steeper, comparator, singlechip, GPRS module, battery, humidity transducer, wireless communication module, GPRS antenna, wireless communication antenna, the leakage current sensor low pass filter rectifier circuit the steeper the comparator the singlechip is consecutive to be connect, the singlechip respectively with the GPRS module the battery humidity transducer wireless communication module is connected, the GPRS module is passed through the GPRS antenna is communicated with the mobile device, wireless communication module passes through the wireless communication antenna is communicated with the handheld equipment of patrolling and examining. The utility model discloses a filthy condition of timing detection insulator and in the long -pending dirty pollution flashover early warning of sending when serious.