Bogie is one of the most critical parts of high-speed train. It is directly related to the operation quality and safety of the train. However, there is no a dynamic nondestructive testing method for real-time monitoring at present. For the high-speed train bogie dynamic testing, this paper put forward a new damage localization method. Using the acoustic emission testing technology, time reversal localization method to the vulnerable welding parts of the bogie was studied. First of all, the bogie welding parts structure model was established based on finite element software; then we sent an acoustic emission damage signal to the model and receive the acoustic emission source signal by the preset acoustic emission sensor; finally the accurate localization of damage was achieved by dealing with the received signal according to the time reversal focusing principle and imaging the acoustic emission source. The simulation experiment results show that this method can find the location of damage accurately.