The invention discloses a Chinese herbal medicine feed additive containing pithecellobium clypearia, a preparation method and application thereof, and particularly relates to the field of feed additives. The Chinese herbal medicine feed additive comprises the following raw materials (in parts by weight): 60-100 parts of pithecellobium clypearia, 20-60 parts of fructus alpiniae oxyphyllae, 10-30 parts of hawthorn, 10-30 parts of nutmeg, 5-20 parts of herba lycopi, 1-10 parts of semen cuscutae, 5-20 parts of licorice, and 2-15 parts of lily. The feed additive provided by the invention is safe, free of toxic and side effects, free of drug residues, safe and reliable, and capable of improving animal immunity, and has multiple effects of resisting bacteria, diminishing inflammation, clearing away heat and toxic materials, removing necrotic tissue, promoting tissue regeneration, clearing away lung fire and the like, and capable of treating upper respiratory tract infection and promoting healthy growth of animals, and capable of effectively preventing and treating the symptoms such as diarrhea and ulcer of animals in the stress period.