Gelatin (or gelatine) is a translucent, colorless, brittle (when dry), flavorless solid substance, derived from the collagen mainly inside pig skin (hide) and cattle bones. It is commonly used as a gelling agent in food, pharmaceuticals, photography, and cosmetic manufacturing. Substances containing gelatin or functioning in a similar way are called gelatinous. Gelatin is an irreversibly hydrolysed form of collagen, and is classified as a foodstuff. It is found in some gummy candies as well as other products such as marshmallows, gelatin dessert, and some ice cream and yogurt. Household gelatin comes in the form of sheets, granules, or powder. Gelatin is divided into edible gelatin, medicinal gelatin, industrial gelatin, photographic gelatin, and leather glue and bone glue according to the production raw materials, production methods, product quality and product use. main application: (1).Eat gelatin. It is an important ingredient and additive in the food industry. It is often used as a gelling agent, stabilizer, emulsifier, thickener and clarifying agent in the production of meat products, cakes, ice cream, beer, juice, etc. (2).Biofilm material. The most studied gelatin base film materials are mainly chitosan-gelatin blend film, gelatin-silk fibroin blend film, polylactic acid-gelatin blend film and polyvinyl alcohol-gelatin blend film, etc. These mixed materials are greatly improved. The physical and chemical properties of gelatin make the gelatin-based polymer film material more functional. (3).Medical fiber. The blending of other composite materials with gelatin improves the mechanical properties of gelatin-based medical fiber materials. Tissue repair and replacement. (4).Industrial gelatin. Used in the manufacture of fiber textiles, insulating materials, paper, holographic materials, etc.