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The metal wear debris in mechanical transmission can feedback the characteristics of mechanical equipment failure, aiming at the requirement of online fault detection of mechanical transmission system, a three-coil inductive metal abrasive particle detection system is proposed. By establishing the mathematical model of the sensor, the parameters affecting the metal detection sensitivity of the sensor are simulated, and the optimal solution is obtained combined with the actual use of the sensor. Through the design of excitation signal source module, amplitude modulation module, signal conditioning module and other circuits, combined with the host computer, the metal abrasive particles in the oil are detected. Through the experimental test of the runner with an aperture of 8mm, this system can achieve the detection accuracy of 500μm iron abrasive grains and 1000μm copper abrasive grains. The system provides technical support for the detection of metal abrasive particles in engine, and is of great significance for fault prevention and diagnosis.