Due to the fast response requirements, the contact surface of valve body stopper for the sequential turbocharging switch valve bears a greater impact. In order to explore the impact effect of contact surface, ANSYS finite element simulation software was used to establish the contact relationship between various components and the finite element analysis model, the transient dynamic simulation analysis of sequential turbocharging switch valve was carried out under five working conditions, the impact damage area was predicted, and the change laws of impact strength for the contact surface of valve plate and valve body stopper during the closing process of switch valve were obtained. The simulation results show that the velocity and stress of switch valve reach the peak at the position that the valve plate and the valve body stopper are farthest from the shaft. The total shock response time of valve plate and valve body stopper is around 5 ms. The error between the theoretical calculation value and the simulation result for the contact surface stress of valve body during the shock process of sequential pressurized switch valve is within 10%, which shows that the theoretical calculation value and the simulation result is in good agreement.