The invention discloses digestive yogurt containing modified starch and a preparation method thereof. The yogurt is prepared from the following raw materials in parts by weight: 80-120 parts of bovinecolostrum, 1-5 parts of the modified starch, 2-6 parts of fruit juice concentrate, 0.1-1 part of a sweetening agent, 0.1-1 part of probiotics and 0.5-1.5 parts of prebiotics, wherein the modified starch is composed of corn modified starch, cassava modified starch and potato modified starch according to a mass ratio of 1 to (3 to 5) to 2. The digestive yogurt containing the modified starch disclosed by the invention is rich in nutrition, and delicate and smooth in mouthfeel, has the functions of regulating the balance of human intestinal microecology, improving intestinal function, aiding digestion, reducing lipids and blood pressure, enhancing human immunity, and resisting aging, and is suitable for children, the aged and diabetics to eat; meanwhile, the preparation method of the yogurt is simple and practicable, strong in operability, low in cost, and is suitable for industrialized production and application.