Abstract: It is seriously interfered by ship noise when analyzing and extracting broadband spark sound source signal. In the energy concentrated domain which is below 5 kHz, the traditional scale correlation filtering algorithm, which is based on adjacent-scale correlation, has limited anti-interference ability due to the low signal-to-noise ratio (SNR) and similar Lipschitz exponent characteristic of each other. However, because different frequency bands of the broadband electric spark signal have different noise interferences, the filtering algorithm based on adjacent-scale correlation is adapted to high SNR and small-scMe high-frequency wavelet coefficients filtering; the filtering algorithm based on crossscale correlation is adapted to low SNR and large-scale low-frequency wavelet coefficients filtering, and the threshold coefficient selection method had been corrected in the algorithm. It is shown that the filtering Mgorithm has a good filtering effect and extracts the broadband spark sound source signM effectively; it is applicable to broadband underwater acoustic signal processing in the presence of narrow-band strong interference background noise.