Traditional processing of plant extracts, traditional Chinese medicine liquids, biological fermentation broths and dairy materials relies heavily on thermal evaporation and chemical purification, which inevitably causes active ingredient loss, product color deterioration and high energy consumption. Membrane separation technology integrates microfiltration, ultrafiltration, nanofiltration and reverse osmosis to realize graded impurity removal, clarification, desalination and low-temperature concentration through physical screening. The whole process operates under mild conditions without high-temperature heating and chemical addition, effectively protecting heat-sensitive active substances and improving product purity and yield. As a comprehensive green manufacturing solution, multi-stage membrane combination technology has become the standard upgrading process for modern fine biological processing.