This study addresses the challenges in visual management of subway engineering projects, including insufficient model refinement, inadequate data integration and display, and a lack of authenticity in visualization. GIS and BIM technologies are proposed as solutions for real-scene 3D construction visualization in subway projects. The research first establishes a framework for developing a real-scene 3D visualization platform for subway engineering, analyzing key technologies such as data integration and fusion, dynamic hierarchical loading, model lightweighting, and display. Subsequently, a case study of the Shenzhen Metro Line 14 project is presented, focusing on the construction and functional application of the real-scene 3D visualization platform. The case study includes engineering construction management maps, spatial analysis visualization, multi-view scene navigation, and BIM visualization and attribute queries. This approach facilitates the integration of multi-source heterogeneous data and models, providing multi-scale real-scene 3D visualization and offering robust support for project management and decision-making.