The invention relates to a method for leaching peanut shell polyphenol through ethyl alcohol with the assistance of a biological enzymolysis composite microwave technology, and belongs to the technical field of food processing. Peanut shell powder and cellulase are put into an ethyl alcohol water solution; enzymolysis is performed for 3h under the condition of the temperature being 60 DEG C and the pH being 4 to 5; enzymolysis liquid subjected to enzyme inactivation cooling reacts for 72 to 75s in microwaves with the power of 650 to 800W; after suction filtration, filter liquid is left; vacuum concentration and freeze drying are performed to obtain peanut shell polyphenol extract powder. Compared with a traditional hot dipping method, a reflux method, a Soxhlet extraction method, a superhigh pressure technique extraction and supercritical CO2 extraction method, and the like, the method provided by the invention has the advantages that the peanut shell polyphenol yield is high; the technological process is simple and convenient; the time is relatively short; the energy consumption is low. Compared with a microwave assisted extraction and enzyme assisted extraction method, the method provided by the invention has the advantages that the enzymolysis and alcohol extraction are simultaneously performed; the extraction rate and the production efficiency are improved; the industrial production is easy.