Abstract - 596806 Disclosed herein is a method of preparing a green milk powder, comprising the following steps: pretreatment, comprising cutting a plant sprout at 2~5cm above the ground when the plant sprout grows up to 25~45 cm high, washing soil and impurity away from the plant sprout surface, washing the plant sprout by ozonized sterilization running water, and then washing the plant sprout by deionized running water at room temperature, and crushing the plant sprout; filtration, comprising juicing, filtering, and extracting juice from the 10 crushed plant sprout; blend, comprising mixing the plant sprout juice and a whole milk in pre-determined proportion to uniformity until the mixture becomes a homogeneous juice; wherein the plant sprout juice is 0.1~40 % by weight of the whole milk; concentration, comprising concentrating the homogeneous juice by evaporation using an evaporator until it becomes a concentrated liquid; and drying the concentrated liquid and making it into a milk powder.