The invention discloses a nutrient compound type yogurt and a preparation method thereof. Ingredients used and percentages of the nutrient compound type yogurt are as follows: 40 to 80 percent of fresh milk or 6 to 15 percent of milk powder, 0.1 to 15 percent of nutrient complex substance (mixture of one or two or three of collagen protein, sweet potato and oats), 2 to 10 percent of white sugar, 2 to 8 percent of a mixed fermenting agent mixing with bulgaria lactobacillus and streptococcus thermophilus and the margin is water. The yogurt of the invention is characterized in that: the nutrientcomplex substance is added with the collagen protein, the sweet potato and the oats, thus being capable of realizing nutrient complementation of animals and plants, wherein, the collagen protein contained has the effects of facial beautification and skin maintenance, anti-osteoporosis, etc. The cancel prevention of the sweet potato ranks the first among fruits and vegetables and the sweet potato can promote the absorption and utilization ratio of protein; the content of protein contained in the oats ranks at top among grain crops, the oats also contains 8 kinds of amino acids needed by human body, the calcium content of the oats is also higher than other food crops and the contents of vitamins B1 and B2 are also quite abundant. Compared with the existing yogurt, the nutrient supplementation of the yogurt of the invention is more reasonable and complete, thus being a health-care food being applicable both to the old and the young.