The invention discloses a Chinese medicinal herb additive for egg ducks and application thereof. The Chinese medicinal herb additive comprises amur corktree bark, eucommia bark, honeysuckle, szechwon tangshen root, sanguisorba, hawthorn, Indian Buead, officinal magnolia bark, Chinese pulsatilla root, giant knotweed rhizome, ricepaperplant pith, largehead atractylodes rhizome, tangerine peel, malt, indigowoad root, swordlike atractylodes rhizome, indigowoad leaf, three immortals, liquorice, cyrtomium fortune, nutgrass galingale rhizome, chatoyancy and calamus, and mixture of the compositions is added with calcium bicarbonate, phytase, vitamin E and methionine. The Chinese medicinal herb additive effectively promotes absorption of nutrient, can prevent and control diseases, strengthen quality of eggshells, reduce the broken egg rate and soft-shell eggs, abnormal eggs and sand shell eggs, can effectively prevent bird flu, prevent and control diseases such as laxness, feather pecking, hair shedding, anus pecking, salpingitis, respiratory disease and the like, can achieve good effect with a dosage of about 4 percent, cannot damage physiological functions of the egg ducks, and can prolong egg laying peak season, improve color of the eggshells and the laying rate by 9 to 20 percent, and increase weight of eggs.