The hydraulic filter element is used in the hydraulic system to filter out the particles and rubber impurities in the system to ensure the cleanliness of the hydraulic system. Industrial hydraulic oil filter element is imported from foreign factory. It is double-layer superfine fiber structure (inner layer fine fiber, outer layer coarse fiber) from inside to outside gradually loosening structure. It can reduce the differential pressure of filter element, increase the amount of dirt in filter element and prolong the service life.