Transmission line played an important role in power system and made a difference in safe operation of chinese power grid. Based on online monitoring, sensor and wireless communication technology, integrated monitoring system of online monitoring electric transmission line in mine was established to monitor parameters of transmission line tower tilt, conductor and joint temperature, line arrester, video surveillance and sensor output signal was received by acquisition module, which would be transfered to background monitoring center to be managed, which improved line work security and operating reliability of electronic power system.