The invention relates to a method for extracting anthocyanin from the fruit dregs of Nitraria sibirica Pall. The method comprises the following working procedures of enzymolysis, extraction, separation, purification, elution, concentration and drying. The method in the invention is simple and the extraction rate is up to 80%, thus the resource can be utilized comprehensively; the method is beneficial for the industrialized production; and the method can provide a novel natural plant raw material of medicines and health food used for preventing tumor, reducing blood sugar, protecting the liverand soothing the gallbladder.