With the continuous acceleration of China's urbanization process, the impact of municipal reconstruction and expansion projects on traffic flow is becoming increasingly prominent. In this paper, a high-precision orthophoto map is taken with the help of a UAV equipped with a visible light camera and used for traffic guidance and reform. The production process and accuracy control method of high-precision orthophoto map are described in detail, along with its usage and functional effect of traffic diversion and modification in municipal engineering are analyzed, and the application is carried out through engineering examples. The results show that the high-precision orthophoto map has a good application effect in site environmental investigation, auxiliary traffic organization scheme design and real-time monitoring and adjustment of the guidance and reform effect. At the same time, they can be overlaid with design drawings and BIM models for guidance and renovation construction technology disclosure, reducing the average travel time of vehicles by 15%, reducing the rework rate of fence installation by 20%, and saving project costs of more than 1.5 million yuan.