The invention discloses a method for storing green feed, which comprises (1) classifying corns in the wax ripeness stage into leaves, leaf sheaths, stems and corns, and measuring chemical compositions of various parts, with measurement indices of crude protein (CP), neutral detergent fiber (NDF) and water soluble carbohydrate (WSC); (2) preparing enzyme preparation solutions with four concentration gradients and lactobacillus solutions with four concentration gradients, adding enzyme preparation solutions and lactobacillus solutions with different concentration gradients into leaves, leaf sheaths, stems and corns, respectively, and ensiling; (3) analyzing the chemical composition of silage, including pH value, lactic acid, NDF, CP and WSC; (4) mixing silages subjected to the same treatment, and drying at 60-70 DEG C; and (5) determining the type and amount of additives with different chemical composition characteristics, which are added into the green feed in accordance with silage fermentation characteristics and in vitro fermentation characteristics. The inventive method has simple process and easy operation, and can effectively reduce loss of nutrients such as proteins in the green feed and improve the utilization ratio of nutritional ingredients in the green feed.