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Automobile electronic leakage signal with strong weak sex and instantaneity. Current leakage signal detection method can't avoid this kind of weak sex and instantaneity,the characteristics of leakage signal detection accuracy is low. Designs and realizes a new kind of automobile electronic leakage signal detection system. The system consists of hardware part and software part. In the aspect of hardware design mainly introduces the leakage based on PCI1712 data acquisition card signal acquisition module and a filter circuit; Software part completed by LADVIEM and MATLAB simulation software programming,expounds the design method of wavelet transform filter,and gives some leakage signal acquisition program. The experimental results show that the system can effectively improve the accuracy of the automobile electronic leakage signal detection and detection efficiency. 