Fuente: WIPO "dairy products" The invention discloses long-acting red-yeast fermented milk, a raw material composition thereof and a preparation method of the long-acting red-yeast fermented milk, belongs to the technical field of food and relates to dairy processing. The long-acting red-yeast fermented milk is prepared from fresh milk, a red yeast fermented product, cane sugar and lactobacillus rhamnosus, wherein based on 100 parts of fresh milk, the volume of the red yeast fermented product is 8% to 10% that of the fresh milk, the weight of the cane sugar is 8% to 12% that of the fresh milk, and the volume of the lactobacillus rhamnosus is 3% to 5% that of the fresh milk. The long-acting red-yeast fermented milk is prepared through mixing the fresh milk, the red yeast fermented product and the cane sugar, then, carrying out high-pressure homogenizing, inoculating the homogenized mixture with the lactobacillus rhamnosus, and carrying out anaerobic fermentation for 24 to 32 hours at the constant temperature of 38 DEG C to 43 DEG C. According to the long-acting red-yeast fermented milk, the raw material composition thereof and the preparation method of the long-acting red-yeast fermented milk, both nutrients and functional components of red yeast and fermented milk are taken into account, and post-acidification is controlled while the quantity of viable bacteria in the fermented milk is kept, so that the shelf life is prolonged.