The high precision oil filter applies the principle of environmental fiber filter element treatment. Based on this technology, an independent circulating off-line and bypass oil processor is designed and developed. This device has high precision fiber filtration material, RSH high precision filter oil machine with absolute accuracy is 3 microns long path filter (means 98.7% greater than 3 microns of solid particles and about 50% of the more than 0.8 microns of solid particles can be blocked in a filter), has the very high carrying quantity, and fiber wiki filter is used to remove particulate matter, Adsorb oil degradation (oxide, resin/sludge, varnish and other impurities), and absorb a small amount of water in the oil. The processing precision and performance can not be achieved by the traditional pipeline filter, which can maintain the cleanliness of the oil for a long time, remove the mechanical impurities in the oil, thus extending the oxidation time of the oil and improving the service life of the oil. It can clean and filter the liquid in medium and large hydraulic transmission system, lubrication system and cooling system. The use of this equipment reduces the wear of mechanical parts and reduces the frequency of equipment repair, maintenance, maintenance and oil replacement, greatly reduces the cost of equipment management, and improves the economic benefits of enterprises.