Abstract: Due to network security, the application of wireless LAN in the substation has not been promoted, which hinders the access of various energy Internet mobile smart terminals in the substation, such as inspection robots, intelligent safety surveillance cameras and other emerging services. This paper analyzes the pros and cons of several commonly used wireless networking modes, and proposes a wireless local area network solution based on the WAPI network, which adopts a centralized management and authentication mode to improve the security of the business channel. The implementation results show that the solution is safe and reliable, the signal strength and network speed meet the requirements, and the construction cost is reasonable. It solves the problem of the "last mile" network coverage of the substation and provides a reference for the planning and construction of the ubiquitous power Internet of Things network layer.