In order to put forward an effective treatment scheme for the leakage of foundation pit of switch machine in metro tunnel during operation period, the treatment scheme for the leakage of foundation pit of switch machine in vibration environment was studied by field test method based on a metro tunnel in a southern city. The results show that the seepage control of the foundation pit of turnout machine in metro tunnels during operation can be divided into three steps. Firstly, the water and debris in the foundation pit are thoroughly cleared, the polluted concrete on the surface of the foundation pit is polished and the normal concrete leaks out. Secondly, cement-based temporary water plugging material, hydrophilic epoxy grouting material, polysulfide sealant and modified silane sealant are used to treat the leakage water on the surface of foundation pit. Finally, the hydrophilic epoxy grouting material was used to treat the floor cracks. Six months after the completion of the treatment project, the site was in good condition, and no leakage occurred in the foundation pit. It can be seen that the comprehensive treatment scheme of "surface treatment + bottom grouting" can not only make the seepage treatment process targeted, but also play a multiple waterproof role.