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At present, there is a problem that the ability of crack induced voltage is poor in the design of engine blade crack detection system, which leads to large error of defect signal peak detection results. Therefore, a new engine blade crack detection system based on Harris SUSAN algorithm is proposed. In this paper, the high sensitive two-axis Honeywell anisotropic magnetoresistance (AMR) element is used to analyze the distribution and variation of magnetic field in the horizontal and vertical directions. The sensor is designed and the rotating electromagnetic excitation platform is selected to realize the rotating magnetization of the excitation platform. The Harris SUSAN algorithm is used to set up the detection program, calculate the value of interest to determine the best advantage, and compare the magnetic field strength to detect the engine blade crack. The experimental results show that the crack detection system based on Harris SUSAN algorithm can effectively improve the ability of crack induced voltage and enhance the detection accuracy of defect signal peak detection results.