Polyester PBT is selected and melt-blown materials with different fiber diameters are produced through the melt-blowing process. These materials can be compounded with corresponding wood pulp and chemical fiber materials according to different application scenarios and used in the manufacturing of liquid filtration cartridges. The product features high filtration accuracy, large flow capacity and strong dirt-holding capacity. By combining with fiber materials of different densities and finenesses, it achieves excellent water separation performance. The material also has the characteristics of corrosion resistance, heat resistance and oil resistance. The material is widely used in many fields such as fuel filtration and oil-water separation.