Trehalose is a typical stress metabolite, which can form a unique protective film on the cell surface under harsh environmental conditions such as high temperature, high cold, high osmotic pressure and dry water loss, effectively protecting the biomolecular structure from being destroyed, thus maintaining the life process and biological characteristics of living organisms. Because of its unique biological function, it can effectively maintain the stability and integrity of intracellular biofilm, protein and active peptide in adversity, and is praised as the sugar of life, which can be widely used in various industries such as biological agents, medicine, food, health care products, fine chemicals, cosmetics, feed and agricultural science.