The invention discloses easy-to-brew kudzuvine root powder. A formula is composed of the following components of, in parts by weight, 0-20 parts of whole milk powder, 5-14 parts of edible kudzuvine root powder, 2-12 parts of dextrin, 1-8 parts of prebiotics, 0-7 parts of a sweetening agent, 0-6 parts of protein powder, 0-1 part of r-aminobutyric acid, 0-4 parts of aronia powder, 0-4 parts of momordica grosvenori powder, 0-3 parts of yam powder, 0-3 parts of lily powder, 0-4 parts of lotus root powder, 0-4 parts of water chestnut powder, 0-3 parts of gorgon fruit powder and 0-3 parts of aloe. The invention also discloses a preparation method of the easy-to-brew kudzuvine root flour. The method comprises the following specific steps of S1, premixing the raw materials in the formula; S2, granulating the premixed raw materials; S3, drying the granulated granular raw materials; and S4, screening dried samples.