During the operation of mechanical equipment, the wear of the tribol-pair will cause the debris to enter the oil system and circulate in the oil system. The characteristic information of the debris can reflect the health status of equipment. Therefore, it is an effective method to monitor the operating state of mechanical equipment by detecting the debris. In this paper, an inductive particle detector debris sensor based on multiple excitation coils is presented for a large inner diameter oil pipe. The sensor evenly distributes M(M ≥ 3) electromagnets in the circumferential direction of the oil passage. The excitation coil of electromagnets is driven to generate a uniformly-distributed magnetic field. The induction coil of the sensor is wound around the oil pipeline. When the debris passes through the induction coil, the magnetic flux of the induction coil changes, which will produce the corresponding induction voltage. The result of the simulation experiment is that increasing the number of electromagnets is beneficial to improve the uniformity of the magnetic field distribution. In addition, as the distance of the electromagnet decreases, the signal-to-noise ratio of the output signal decreases.