The ultrafiltration membrane is a microporous membrane with a uniform pore size and a nominal pore size range of 0.01 micron or less. By applying a suitable pressure to one side of the membrane, solute molecules smaller than the pore size can be sieved to separate particles having a molecular weight of more than 500 Daltons (atomic mass units) and a particle diameter of more than 10 nm. Ultrafiltration membrane was one of the earliest developed polymer separation membranes. In the 1960s, ultrafiltration equipment was industrialized. Ultrafiltration membranes are widely used in industrial applications and have become one of the new chemical unit operations. It is used in separation, concentration, purification of biological products, pharmaceutical products and food industry; it is also used in terminal treatment equipment in blood treatment, wastewater treatment and ultrapure water preparation. In China, the ultrafiltration membrane has been successfully used for the purification and purification of Chinese herbal medicines and the development and use of water purification equipment, especially the PVC alloy ultrafiltration membrane developed in China, which has overcome the world problem of industrial PVC production of high quality ultrafiltration membranes. The production cost and operating energy consumption of the ultrafiltration membrane are reduced, and the filtration performance and service life of the ultrafiltration membrane are improved, and it is listed as a recommended product for energy conservation and emission reduction by the State Intellectual Property Office.  Ultrafiltration membranes With the advancement of technology, its screening function will be improved and strengthened, and its contribution to human society will also grow.