The invention belongs to the technical field of food processing, and particularly relates to slowly digestible potato steamed bread rich in grape seed proanthocyanidin and a making method of the steamed bread. The slowly digestible potato steamed bread comprises flour, mashed potatoes, water, yeast, cane sugar, salt and grape seed extracts. According to the steamed bread, the grape seed extracts are added and serves as a functional component, the prepared steamed bread has a remarkable slowly digestible health care function, and blood sugar reaction of a high blood sugar and high blood lipid patient can be improved when the patient eats the steamed bread. The fresh mashed potatoes are added to prepare the steamed bread, and a nutritive value of the steamed bread is improved, so that the steamed bread has light potato fragrance and grape fragrance. The steamed bread meets current requirement for healthy staple food, waste is turned into wealth, comprehensive utilization is facilitated,a processing industry chain value of staple food grains is widened, the processing conversion rate of agricultural products is increased, the ratio of processing production to gross agricultural output value is further increased, and the steamed bread has wide market prospects.