The UCP fusion jet filter core is made of polypropylene superfine fiber thermally fused tangles, which is heated to melt and spray wire and traction, and accepted the deep filter core with a certain aperture gradient. The three-dimensional microporous structure is formed by the random self-bonding of fibers in space, with the combination of the surface layer, deep layer and coarse filter, the structure of the filter core is the outer fiber, and the inner fiber is thin and thin, gradually and gradually tight structure, forming the layered filtering effect, which is produced as a whole at one time. Can be used in reverse osmosis system security filtration, drinking water filtration and so on.