Abstract: Aiming at problems of the computer video cable (VGA, DVI) coupling leakage signal detection and reconstruction, the signal denoising method based on wavelet transform spatial correlation filtering is proposed. Firstly, the experiment system is designed to get the leakage signal of video cable. Then, the collected leakage signal is processed by wavelet transformation, the noise and red signal is separated through spatial correlation filtering. Finally, the original video signal through edge detection is reconstructed, and the influence of different signal-noise ratio on reconstruction rate is analyze. Experimental results show that the spatial correlation filtering method can effectively suppress noise and improve the weak leakage signal reconstruction quality. The method has a great application value in the conduction leakage signal.