The invention discloses a composite feed additive for replacing antibiotics to prevent and control chicken coccidiosis. Aiming at the pathogenesis, the pathogenetic condition and the symptoms of the chicken coccidiosis, starting from the aspects of increasing the immunity, killing parasites, stop bleeding, diminishing inflammation, repairing the intestinal tract and the like, dichroae radix, radixbupleuri, sweet wormwood herb, flos imperatae, folium artemisiae argyi, pollen typhae, montmorillonite, licorice roots and other Chinese herbal medicines for killing the parasites, stopping bleedingand diminishing inflammation are selected to be scientifically compounded, multiple vitamins, egg fetus powder, selenium yeast, glycine zinc and other nutrient substances with immune functions are selected to be compounded, and the composite feed additive has the functions of resisting the parasites, killing the parasites, conditioning the body and the like. Through experiments of artificial infection of coccidiosis, it is shown that after the feed additive is used, the surviving rate of broiler chicken can reach 99%, and the number of coccidian oocysts is reduced along with prolonging of theinfection time.