Abstract: With the power grid construction continues to deepen, the line operating environment is becoming more and more complex, and the pressure on the safe operation of transmission lines and the workload of operation and maintenance has further increased. Traditional transmission lines mainly utilize public wireless network to transmit monitoring data, images and videos, but with the large number of monitoring equipment installed, its promotion will be limited by the low transmission rate, high traffic tariffs and signal coverage constraints of public wireless network. This project is based on Mesh wireless networking technology, and the wireless private network is built on 1000 kV Yue Ding Ⅰ and Ⅱ lines. The overall delay control of the wireless network is less than 100ms, and the use of high-speed 1.5G bandwidth equipment, to ensure that dozens of hundreds of high-definition video signals can be viewed at the same time. In nearly 300 km of wireless transmission, the wireless private network bandwidth stability to maintain about 350 Mbps. The private network accesses all high-definition monitoring equipment of the line, which is used to monitor the external damage of the line in the area of the operating line as well as the cable channel, the construction site, the trees are over high, the unauthorized building, the forest fire, the bird damage and so on. At the same time, the company has developed a transmission line video intelligent identification and warning device, which realizes automatic detection, warning and notification of external damage, super-high objects approaching and foreign objects staying, as well as the function of bird discernment and repulsion.