The invention relates to a method for processing and preparing a green milk powder, comprising the following steps: a. pretreatment: cutting a plant from the position 2-5 cm away from the ground when the tender plant grows to 25-45 cm, washing by tap water to remove soil and impurities on the surface thereof, washing by fresh water after ozone bacteria-killing at room temperature, washing by deionized water, and crushing the tender plant； b. filtering: juicing the obtained crushed tender plant, filtering and taking juice； c. mixing: evenly mixing the juice with raw milk proportionally to prepare into homogenized liquid； d. concentrating: evaporating and concentrating the obtained homogenized liquid by an evaporator to prepare concentrated solution； and e. drying: drying the concentrated solution to prepare into green milk powder. The invention has simple process flow and the processing procedure does not damage thermo-sensitive substances such as vitamin C, chlorophyll, SOD and the like in tender plant.
