Air pressure oil filter, newly developed by benteng Machinery, is one of the most efficient oil filters for edible oil filtration. The air compressor built in air pressure oil filter makes air to go through cylinders into crude oil drum, further, the crude oil is push flow out from filtering cloth. During filtering, the particles and impurities contained in crude oil will be blocked on the filtering cloth and gradually form a layer of residues that is itself a filtering cloth. The filtering efficiency of air pressure oil filter is increasing by pressure rising, which reduced by the thickness of residues. Therefore, the residue should be removed out timely.