With the development of freeze-drying machine, it can be applied in more and more fields, especially in the biological field. Freeze-drying machine is an effective new drying equipment for drying heat sensitive substances and substances that need to maintain biological activity. At present, many domestic pharmaceutical enterprises use freeze-drying method to process drugs, such as various antibiotics, biological extracts, vaccines, enzyme products, etc., and are widely used in the beauty field, such as cosmetics freeze-drying powder, freeze-drying facial mask, etc. 报错 笔记