The nutritional value of powdered milk cannot be directly compared with that of pure milk. The specific composition of milk powder is flexible according to the needs of the body, so it is not possible to compare the nutritional value of milk powder with that of pure milk, which can be chosen according to the needs of the body. Currently, common types of milk powder include infant formula, unsweetened milk powder, calcium, iron and zinc fortified milk powder and so on. The ratio of calcium, iron, zinc, protein, fat and other nutrients will be adjusted according to the different groups of people, so as to adapt to the needs of different organisms for nutrients. When infants choose between powdered milk and pure milk, it is generally recommended to choose powdered milk. Adults or the elderly in the choice, according to their own nutrient deficiencies to choose the appropriate dairy products for consumption to supplement. Cow’s milk is more primitive in composition and is directly consumed after sterilization, so the content of additives in it may be slightly lower than that of powdered milk, but the proportion of each nutrient cannot be directly altered. Therefore, milk is more suitable for healthy bodies or people with no obvious nutritional deficiencies, and is mainly used for daily protein and calcium supplementation. When choosing between powdered milk and pure milk, it is possible to select the right dairy product according to the nutritional requirements.