The embodiment of the invention discloses a green feed additive for goslings and a preparation method of the green feed additive. The green feed additive comprises the following raw materials: codonopsis pilosula, bighead atractylodes rhizome, astragalus mongholicus, Chinese angelica roots, poria cocos, Chinese yams, szechwan lovage rhizome, bitter oranges, tangerine peel, magnolia bark, atractylodes rhizome, hawthorn fruits, medicated leaven, malt and liquorice. The preparation method comprises the steps of mixing and grinding the codonopsis pilosula, the bighead atractylodes rhizome, the astragalus mongholicus, the Chinese angelica roots, the poria cocos, the szechwan lovage rhizome, the bitter oranges, the tangerine peel, the magnolia bark, the atractylodes rhizome, the hawthorn fruitsand the medicated leaven according to proportions into mixed powder for future use, preparing Chinese yam juice, malt juice and liquorice juice from the Chinese yams, the malt and the liquorice respectively using softened water, stirring and mixing the Chinese yam juice, the malt juice, the liquorice, a plant isolated protein and the mixed powder to form gel, adding silicon dioxide powder or calcium carbonate powder for stirring and mixing to form a semifinished additive, shaping the semifinished additive using a mold, and performing dehydration by a constant temperature drying manner. The investment of other antibiotics and disease treatment is reduced; a defense function and production performance are improved; the green feed additive is environmentally friendly; and the cost is saved.