The present invention discloses a pharmaceutical composition for treatment of chicken damaged by heat and a preparation method thereof, the pharmaceutical composition comprises the following raw material medicines: scutellaria baicalensis, gardenia, dendrobium, fructus aurantii, plaster, etrapanax papyriferus, bamboo shavings, honeysuckle, rhizoma anemarrhenae, radix ophiopogonis, golden cypress, commelina, herb of denseflower bulbophyllum, lotus plumule, licorice, frangrant daphne flower, privet leaves, coptis chinensis, zedoary, typha angustifolia root, veronica arvensis, balanophora harlandii Hook.f, rheum officinale, moth cocoon, smilax stans maxim, clematis glauca willd, eryngium foetidum and chamaerhodos erecta, the pharmaceutical composition has the effects of clearing heat and removing toxicity, purging fire, producing fluid and moistening, in the treatment of the chicken damaged by heat, chicken disease resistance can be improved, the immunity is enhanced, mortality is reduced, the cure rate is improved, compared with the treatment effect of traditional medicines, the treatment effect of the pharmaceutical composition is significantly improved, and the course of treatment is significantly shortened.