The invention discloses high-dietary-fiber yogurt and a production method thereof. The high-dietary-fiber yogurt comprises reconstituted milk or fresh milk, fructo-oligosaccharide, whey protein, sucrose, resistant dextrin, lactobacillus bulgaricus, streptococcus thermophilus and the like, wherein the ratio of the lactobacillus bulgaricus to the streptococcus thermophilus is 1:1, and the content of the resistant dextrin is 3-25%. The production method includes: preparing materials, preheating, homogenizing, sterilizing, inoculating, split charging, fermenting and refrigerating. The high-dietary-fiber yogurt has the advantages that the resistant dextrin is low-molecular-weight soluble dietary fibers, has high water-holding capacity, and can absorb water and expand in the intestines and stomach to allow people to have satiety so as to restrain eating; the adding of the high-water-solubility dietary fibers increases the dietary fiber content of the yogurt and is beneficial to the improvement of the water-holding capacity, elasticity, stickness and cohesiveness of fermented milk products; the high-dietary-fiber yogurt can combine the characteristics of lactic acid bacteria and the dietary fibers, improve alteration of intestinal flora, promote mineral absorption, enhance human body immune function, and balance the dietary fiber intake of human bodies.