The invention relates to a double-excitation solenoid type online wear particle detection system adopting a filter. The system is arranged on a hydraulic pipeline, and comprises the filter, a separation and absorption module, a rotary shaping module, an exciting coil I, an induction coil and an exciting coil II which are sequentially arranged on the hydraulic pipeline; the exciting coil I and the exciting coil II are in series-opposing connection; the induction coil is positioned in the center of a part between the exciting coil I and the exciting coil II; an electronic control unit (ECU) is respectively and electrically connected with and used for controlling the filter, the separation and absorption module, the rotary shaping module, the exciting coil I, the exciting coil II and the induction coil; a full-band hydraulic system pressure pulse filter is adopted as the filter; the separation and absorption module consists of a mechanical centrifugal module, a magnetization module, a magnetic absorption module, an electrification module and an electric absorption module which are sequentially connected. The double-excitation solenoid type online wear particle detection system adopts a non-contact measurement way, and has the advantages of being good in signal consistency, high in reliability, strong in detection signals, low in error, and the like.