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Aiming at the weak magnetic flux leakage signals generated by small defects of steel wire rope in electromagnetic detection method, which were often easy to be missed, an accurate identification system for small defects of steel wire rope was designed by using STM32 processor, AD7606 analog-to-digital conversion and other devices. In hardware, a stable double excitation circuit structure was adopted, multi-channel uniform and densely distributed integrated HALL elements picked up magnetic leakage signals, and the signal-to-noise ratio was improved by methods such as weak signal amplification and filtering, small-distance equidistant sampling, high-precision data acquisition, etc. In the software, FFT and digital filtering were used to eliminate the interference of the wave. Tests show that the system can accurately detect small defects on steel wire ropes, and can also detect large defects. The accurate judgment rate is more than 90%, which is better satisfied to the requirements of on-site steel wire rope detection.