The invention relates to a wear particle online monitoring device using filtering, centrifuge and adjacent capacitance. The wear particle online monitoring device using filtering, centrifuge and adjacent capacitance comprises a filter, a temperature control module, a magnetizing module, a mechanical centrifugal module, a rotary magnetic-field centrifugal module, an adsorption module, an adjacent capacitance particle monitoring module and a demagnetizing module, which are sequentially connected. The filter is a pressure pulse filter with the full-band hydraulic system. One end of the filter is provided with an oil inlet, and one end of the demagnetizing module is provided with an oil outlet. The wear particle online monitoring device can realize non-intruding and restraint-free monitoring by introducing the adjacent capacitance sensor technology based on capacitance edge effect. Through magnetization, mechanical centrifuge and the rotary magnetic-field centrifugal module, wear particles in oil can be magnetized and gathered to be large particles moving to the pipe wall and to be adsorbed by the adsorption module, so that intensity of output monitoring signals of the adjacent capacitance sensor is improved. Through the temperature control module and the adjacent capacitance sensor plate structure reasonably designed, noise can be suppressed, and the overall performance of the adjacent capacitance sensor-monitoring device can be optimized.