The invention discloses a method for purifying the proanthocyanidins in peanut coat, comprising the steps of: (1) adding the degreased peanut coat into alcohol solution, microwave extracting and then leaching; concentrating filtrate, and obtaining crude product of the proanthocyanidins by vacuum freezing and drying; (2) preparing the crude product obtained in the step (1) into the proanthocyanidins solution, and passing through HPD-826 macroporous absorption resin filled column; then, eluting by using distilled water for removing impurities and eluting by using alcohol; and (3) concentrating,freezing and drying the obtained eluent of the alcohol, and obtaining the fine finished product of the proanthocyanidins in the peanut coat. The method has high absorption quantity for the proanthocyanidins and purity of the product, and ensures the resin to easily regenerate, thus being applicable to large-scale industrialized production.