With its unique structure and properties, microcrystalline cellulose is widely used in national economic sectors such as medicine and health, food and beverage, and light chemical industry as a disintegrating agent and a stable emulsifier. Because cellulose widely exists in nature, hundreds of billions of tons of cellulose-rich biomass residues can be produced every year in the world. If these residues are well transformed and utilized, they will be a rich resource. In China, the expansion of the production scale of tanning, daily chemicals, medicine, food, and chlor-alkali industries and the improvement of product grades have increased the demand for microcrystalline cellulose year by year, so microcrystalline cellulose has broad market prospects. [4] In foreign countries, microcrystalline cellulose has been included in the US FDA Evaluation of Food Additive Safety Index (GRAS), approved as a food additive in Europe, and included in the FDA's "Inactive Ingredients Guide", and approved in the United Kingdom for non-injection preparation.