The invention discloses a feed and a traditional Chinese medicine composition for preventing and treating coccidiosis in duck, and a preparation method of the feed. The feed comprises a basic feed, microelement additives and traditional Chinese medicine additives, wherein the traditional Chinese medicine additives comprise areca-nuts, chinaberry barks, common carpesium fruits, fructus ulmi, fructus chebulae, nutmeg, torreya seeds, cyrtomium fortunei, garlic, aloes, dried orange peels, rhizoma atractylodis, poria cocos, fructus aurantii immaturus, radix aucklandiae, toosendan fruits, agrimonia pilosa, callicarpa bodinieri, acalypha australis, humifuse euphorbia, cacumen biotae, reed rhizomes, radix ophiopogonis, justicia procumbens, ixeris chinensis, small-leaved premna roots and memorialis. The feed contains the traditional Chinese additives, has functions of benefiting spleen, relieving diarrhea, removing toxic materials and killing intestinal worms, is used for preventing and treating the coccidiosis in duck, and has the advantages that the gastric mucosa is protected, the duck immunity is improved, the coccidiosis in duck does not easily relapse after being healed, and the cost and the price are low.