The uniformity of magnetic field is an important factor affecting the detection accuracy of inductive abrasive sensor. In order to improve the uniformity of the magnetic field of the sensor and study the distribution of coil parameters on the magnetic field of the sensor, the mathematical model of the threecoil of the inductive abrasive particle sensor is established according to the principle of magnetic field superposition. The calculation formula of the magnetic field of the sensor is derived and the evaluation coefficient K of the magnetic field uniformity is proposed. The magnetic field of the inductive abrasive particle sensor was simulated, and the influence of the inner diameter of the coil, the width of the coil, the spacing of the coil and the number of turns of the coil on the magnetic field distribution of the sensor was analyzed. Through the range analysis and analysis of variance, the significance of the optimal combination of coil parameters and the influence of coil parameters on the uniformity of the magnetic field are obtained. The experimental results show that when the coil is the optimal parameter, the sensor has good monitoring ability for the abrasive grains in the range of 70 to 200 μm. The deviation of the abrasive particles in different radial monitoring results is less than 5%, which provides a reference for the design of the sensor coil.