Method for producing Litchi concentrated juice

A method for producing Litchi concentrated juice comprises the steps of cleaning and pitting Litchi pulp, then placing a color fixative into the Litchi pulp to perform soaking, manufacturing pulp into granule pulp, simultaneously using an enzymolysis agent to perform enzymolysis, adopting a vacuum concentrating device to concentrate solid substance in the juice by 16%-18% after the enzymolysis, juicing and natural clarification and filtration, and sterilizing and packing concentrated juice to obtain the Litchi concentrated juice. The color fixative is an aqueous solution prepared by tea polyphenol and ascorbic acid. The enzymolysis agent is an aqueous solution prepared by glucose oxidase and pectinase, wherein the mass concentration of the tea polyphenol and the ascorbic acid in the color fixative is 0.05-0.15%, and the mass concentration of sodium citrate is 0.1-0.3%. The mass concentration of the pectinase and the glucose oxidase is 0.01-0.02%. A pH (potential of hydrogen) value of the color fixative in soa