In response to the demand for non-intrusive measurement of the dynamic characteristics of AC contactors, this paper proposes a acoustic signal-based method for measuring the dynamic parameters of AC contactors by analyzing and researching the sound mechanism of the contactor action process and taking into account the characteristics of sound signals. The method adopts ensemble empirical mode decomposition (EMD) to adaptively decompose and select sensitive components of the sound signal. Furthermore, based on the kurtosis feature of the signal-sensitive components, the acoustic event boundaries in the complete sound signal are accurately segmented and calibrated, thereby determining the key event nodes of the contactor operation and achieving indirect measurement of the dynamic characteristic parameters of the contactor. Experimental results show that this method can effectively measure the dynamic characteristic parameters of the contactor, laying a solid foundation for further research on the operating status of the contactor.