Aiming at the difficult problem of urban underground space waterlogging simulation, the surface-underground space coupling waterlogging simulation method was put forward, the coupled flooding of surface and underground space under rainstorm waterlogging was analyzed, and an example verification and pressure tests in Shenzhen City subway were carried out. The results show that compared to the traditional waterlogging model that only considers surface waterlogging, the accuracy of the surface-underground space coupling waterlogging model has been improved to 87.14%. It was found that under the current platform height of the subway entrance, the rainstorm with rainfall return periods of 50,100, 500, and 1000 a caused water ingress at 8,11, 16, and 18 subway entrances, respectively. If the platform height of the subway entrance is set to exceed the ground height by 0.45 m according to the minimum standard of the specifications, 7.91% of the subway entrances cannot meet the flood prevention requirements when the rainfall recurrence period is greater than 100 a.