To better assess urban flooding disasters, this study explores a hydrodynamic modeling approach and a three-dimensional scene construction technique based on GIS technology for simulating urban flooding. By coupling SWMM with OpenFOAM, a numerical simulation model for urban flood was developed to quantitatively simulate flood processes and obtain grid data of flow velocity, water depth, and discharge at different time points. Regarding urban terrain and building scene models, a method for constructing three-dimensional flood scenario was developed to overcome the limitations of traditional two-dimensional models that only provide single horizontal elevation information. Using the Zhangjiabangqiao Drainage Area in Suizhou City, Hubei Province, China, as a case study, the effectiveness of the urban flood simulation under different return period rainstorms was analyzed. Results indicate that the model exhibits high accuracy in the study area validated by measured rainfall data. Furthermore, three-dimensional flood scene construction accurately reflects the status of urban flood processes, thereby providing technical support for assessing urban flooding disasters and improving urban flood control and drainage capacity.