The invention relates to the technical field of collagen food. The pure collagen milk powder is prepared by concentrating and drying pure collagen milk, and the pure collagen milk is composed of the following raw materials in parts by weight: 10-80 parts of a pure collagen solution, 0.1-1 part of an emulsion stabilizer, 0.25-5 parts of white granulated sugar, 0.15-3 parts of salt, 0.01-0.5 part of a food flavor, and 20-90 parts of drinking water, wherein the pure collagen solution is a pure collagen solution containing small molecule short-chain peptides.
