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Abstract: With the development of economy, automobiles are becoming more and more popular. Some key parts such as brake discs and steering knuckles are prone to some small cracks during the manufacturing and use process. It is necessary to prevent negative effects on the measured object. Next, test the key components. The finite element simulation is carried out for the traditional eddy current sensor, and the sensing characteristics when the excitation coil is coupled with the measured metal are analyzed. A probe based on GMR chip to detect microcracks was designed, and a corresponding test system was developed. The influence of the sensitive axis of the GMR chip on the detection result is analyzed, and the wavelet analysis method is used to process the data, which improves the signal-to-noise ratio of the signal. The experimental results show that the probe has high sensitivity and can detect defects 5mm below the metal surface by adjusting the excitation frequency.