Most of the abnormal wear in the hydraulic system is caused by the metal particles in the hydraulic oil. By detecting these metal particles, the fault can be predicted on time and the loss can be reduced. A simple and effective hydraulic oil micrometal particle rapid detection system is designed. Based on the principle of LC resonance for metal particle detection and the feasibility of experiment is analyzed theoretically. Design and manufacture of microfluidic detection chip, the diameter of microchannel in the experiment is 300 μm. The metal particle counting test is carried out on the detection system. The experiment results show that the signaltonoise ratio of LC resonance detection chip is better than the single coil detection chip when all parameters are the same. When the excitation frequency is higher than the resonance frequency, the ferromagnetic particles passing the detection area will produce an upward pulse. When the excitation frequency is lower than the resonance frequency, the ferromagnetic particles passing the detection area will produce a downward pulse. And the nonferromagnetic metal particles are the opposite. The microfluidic chip and its system can be achieved to distinguish the detection of metal particles. In the experiment condition, a minimum of 50 μm of iron particle and 110 μm of copper particle can be achieved to distinguish the detection.