The invention relates to a preparation method for low caloric value sweetened bean paste stuffing, including soybean dietary fiber->alkali treatment->dealkalization->stir-frying->proportioning->cooling packaging; the invention utilizes the by-product soybean dietary fiber of bean protein production to process low caloric value sweetened bean paste stuffing, and hydrolyzes the lipid from the soybean dietary fiber through alkali treatment, thus completely removing the bad taste and softening the tissue of soybean dietary fiber and further making soft, fine and refreshing bean paste stuffing. The invention not only fully utilizes the by-product of bean products, but also richens the dietary of people as well as satisfies the life needs of people.