A multiparameter oil contaminant detection sensor is designed. Based on singlespiral inductive sensor, the sensor adds another solenoid coil, which can perform inductance detection and capacitance detection. Inductance detection distinguishes between ferromagnetic particles and nonferromagnetic particles in oil; capacitance detection distinguishes between water and air in oil. Compared with traditional singlecoil sensor, this design not only realizes the multiparameter detection of oil contaminants, but also adopts the spiral coil with smaller wire diameter and more turns, which increases the detection sensitivity of the sensor. The experiment platform built with the proposed sensor is used to carry out test experiment. The iron particles with diameter greater than 20 μm and the copper particles with diameter greater than 90 μm can be detected during inductance test; the water drops with diameter greater than 90~100 μm and the air bubbles with diameter greater than 160~170 μm can be detected during capacitance detection. This study and design provides a new method for the rapid detection of oil contaminants, which has certain significance for the field of mechanical equipment fault diagnosis and life prediction.