Wear debris in the hydraulic oil contains a lot of important information about the wear of hydraulic components. The detection of wear debris can prevent hydraulic system failures effectively. The inductive sensor has the shortcoming of weak ability to detect nonferromagnetic metal particles. To solve this problem, this paper proposes an integrated wear debris detection device, which consists of a capacitive sensor and an inductive sensor. The capacitive sensor can distinguish the air bubbles and metal particles in hydraulic oil. The inductive sensor can distinguish the ferromagnetic and nonferromagnetic metal particles in hydraulic oil. By combining the detection results of two sensors, air bubbles, ferromagnetic and nonferromagnetic metal particles can be detected with a high sensitivity. The designed wear debris detection device in this study can detect and distinguish 80 μm air bubbles, 30 μm iron particles and 45 μm copper particles. The integration of the capacitive sensor and the inductive sensor compensates for the shortcomings of the two detection methods effectively. The combination of multiple types of sensors is of great significance for improving the detection accuracy of the wear debris detection device.