As infrastructure construction progresses, the maintenance management of bridges faces immense challenges. Combining digital twin, BIM, GIS, IoT, and other technologies, this paper proposes the overall architecture and technical framework of a bridge maintenance management platform based on digital twins technology. The paper studies key platform technologies such as three-dimensional environment performance optimization and equipment digital twin mapping, and implements various specific platform functions. The platform is applied to the Yinjiang River Bridge in Taizhou City and other similar bridges, which optimizes management methods, improves maintenance efficiency, and further promotes the digital transformation of maintenance management methods.