Abstract: based on continuous wavelet transform (CWT) was proposed. Centered on CWT analysis，a non-destructive detection system tailored for performance testing faults in aviation products was developed. The acquired vibration time-domain signals from the test product were processed using CWT. This enabled precise localization of fault characteristics through time-frequency features. A comparison with the Short-time Fourier Transform detection method demonstrated CWT’s superior capability in instantaneous fault localization. The results indicate that the CWT-based non-destructive fault detection technology achieves high-precision fault detection， particularly exhibiting excellent localization capability for transient and impact-type faults. This technology holds significant practical implications for fault detection in aviation products.