Based on the technology of internet of things, an energy saving system of highway tunnel lighting is designed. Through collecting the illumination intensity of the tunnel and monitoring the vehicle flow rate, a data manage ARM system which can collect, save and send dates are constructed, and a remote data server based on TCP/IP is built. By using fuzzy strategy, the lighting control system in tunnel is realized according to the realtime vehicle flow rate and the illumination intensity, which can save the energy of tunnel lighting. Practical system shows that the proposed system based on the Internet of things is stable, it also can lower 20% lighting energy, and it is easy to promote to other cases.