The invention provides a Chinese herbal medicine mixed fermentation feed and a preparation method thereof, and belongs to the technical field of animal feeds and animal feeding. The Chinese herbal medicine mixed fermentation feed comprises a mixed dry material containing a Chinese herbal medicine feed additive, and a fermentation material cured through fermentation, wherein the Chinese herbal medicine feed additive comprises the following components of plantain herbs, common andrographis herbs, astragalus membranaceus, villous amomum fruits, medicated leaven, radix codonopsis, epimedium, radix phytolaccae, rhizoma polygonati, cortex magnoliae officinalis, Chinese magnoliavine fruits, acanthopanax barks, cyrtomium rhizomes, Chinese rhubarb, heartleaf houttuynia herbs, ginger, mulberry, mint, lophatherum herbs, capejasmine, radix scutellariae, reed rhizomes, great burdock achene, haws, licorice roots, pine needle meal and the like. The Chinese herbal medicine mixed fermentation disclosed by the invention aims to solve the problems that adverse medicines and heavy metal are remained in animal bodies, the meat quality is poor and the like, and safe, green, delicious, fragrant and sweet animal meat products are produced; and besides, the immunity of animals is enhanced, the growth of the animals is promoted, and under the circumstance that medicine additives of the kind of antibiotics are not used, the attack rate and the mortality rate are reduced.