The invention discloses sweets rich in dietary fibers and a preparation method of the sweets. The sweets rich in dietary fibers disclosed by the invention are made from the following substances in parts by weight: 40-70 parts of water soluble dietary fibers, 5-15 parts of resistant starch, 5-10 parts of sugar alcohol, 10-20 parts of white granulated sugar and 0.5-2 parts of soybean lecithin. The sweets rich in dietary fibers, disclosed by the invention, contain many dietary fibers and little sugar and little fat, are good in mouth feel, are convenient to eat, and can improve the function of intestinal tracts and reduce adverse impact caused by high sugar and high fat in the sweets. The preparation method of the sweets rich in dietary fibers disclosed by the invention is simple, and the prepared sweets have the effects of loosening the bowel to relieve constipation, regulating blood sugar and blood fat, reducing cholesterol, improving the function of the intestinal tracts and controlling weight, are beneficial to the physical health of people, and are extremely suitable for crowds suffering from high blood pressure, high blood fat, high cholesterol, diabetes, obesity, constipation, intestinal tract diseases and the like to eat.