Method for extracting cyanidin from black bean peel

The invention relates to a method for extracting cyanidin from black bean peel, which comprises the following steps: A) after cleaning black bean peel, adding water and ethanol into the black bean peel to carry out extraction, thereby obtaining an extracting solution; B) carrying out centrifugal separation on the extracting solution to obtain a supernatant, carrying out trash extraction on the supernatant with a ceramic membrane to obtain a ceramic membrane permeation solution; C) concentrating the ceramic membrane permeation solution with an organic nanofiltration membrane to obtain a concentrated solution, and eluting the resin to obtain an eluate; and D) carrying out spray drying on the eluate to obtain the cyanidin. By adopting the centrifugal machine separation, membrane separation and resin integration technology, the invention can effectively lower the production cost, shorten the extraction separation time and enhance the product yield and product purity.