Hollow fiber ultrafiltration membrane is a mainstream precision separation element with self-supporting microporous structure, featuring high packing density, large flux and low operating pressure. It is widely used for fine clarification, impurity removal and purification of plant extracts, traditional Chinese medicine liquid, fermentation broth and process water. Different from tubular and spiral membrane elements, hollow fiber membranes provide ultra-large filtration area in compact space, realizing high-efficiency physical filtration. With flexible backwashing and anti-fouling performance, hollow fiber ultrafiltration has become the most widely used core membrane equipment for industrial primary refining and water treatment.