In order to realize the structural health monitoring of steel plate parts in automobile and ship industries, a method combining wavelet packet threshold denoising (WPT) and ensemble empirical mode decomposition (EEMD) denoising method was proposed to improve the locating accuracy of damage sources for the vibration signals during impact and collision damage. Firstly, the impact damage test system of steel plate under dynamic environment was designed and the experimental scheme was designed. The damage time data was collected. Secondly, the damage signal was denoising by WPT-EEMD and the signal to noise ratio was improved effectively. The time of the signal arriving at each sensor was obtained by threshold detection. Finally, based on the time-delay superposition algorithm, the localization imaging of the damage area in the steel plate was completed. The experimental results show that the method can effectively locate the position of impact damage on the steel plate under dynamic environment, which provides an idea for solving the problem of dynamic nondestructive monitoring.