BIM technology is highly integrated with computer graphics, image processing technology, data analysis technology, three-dimensional modeling technology and other technologies, and is an important technology in the design of municipal road and bridge projects. This paper applies BIM visualization technology to municipal road and bridge design, makes full use of the advantages of BIM technology three-dimensional modeling visualization to achieve real-time sharing of municipal road and bridge design data and solutions, optimizes the design process of municipal road and bridge, improves the rationality and science of municipal road and bridge design, and provides design management and sharing platform support for the orderly advancement of municipal road and bridge construction operations and scientific decision-making of the project. On the basis of discussing the application advantages of BIM technology in municipal road and bridge design, this paper lists the specific applications of BIM technology in municipal road and bridge design. It discusses the in-depth application of BIM technology in the design of municipal roads and bridges from the aspects of checking the relationship between roads and slab and beam nodes in municipal roads and bridges, improving the integration system, demonstrating the design scheme of municipal roads and bridges, displaying three-dimensional visualization of municipal roads and bridges, and supplementing design data.