In order to study the aerodynamic effect of high-speed trains passing through underground stations, it provides a reference for the design of underground high-speed railway stations. Based on the background of an underground high-speed railway station, a numerical model of tunnel-underground station-train was established by numerical simulations. The calculation method of sliding mesh was used to simulate the train running through the underground station. The train speed was selected at 200 km/h, 250 km/h, 300 km/h and 350 km/h, and 25 measuring points were arranged on the platform for monitoring. The influences of the train speed and platform position on the aerodynamic wind field on the platform was studied. The results show that: (1) The aerodynamic effect on the platform changes more with the increase of train speed; (2) After the train passes through the underground platform, it will also produce coda waves that cannot be ignored; (3) The highest fluctuation value of the aerodynamic wind field on the platform is at the entrance of the platform.