The invention discloses a traditional Chinese medicine preparation for treating rash and belongs to the field of traditional Chinese medicines. The raw material compositions of the effective ingredients of the traditional Chinese medicine preparation disclosed by the invention are as follows: schizonepeta, periostracum cicada, fructus kochiae, saposhnikovia divaricata, dandelion, mint, capillary artemisia, pericarpium granati, paris polyphylla, cimicifugae foetidae, ligusticum sinense oliver, whelk, kelp, elsholtzia, ligustrum sinense and cape jasmine. The traditional Chinese medicine preparation disclosed by the invention is appropriate in the compatibility of the selected medicinal materials, has the effects of clearing heat and removing toxicity, diminishing swelling and relieving itching, and disinfecting and sterilizing, has a remarkable curative effect on treating skin rash diseases such as dermatitis, eczema and miliaria and eliminating or retarding the skin itchiness and the like caused by the biting of mosquitoes, bees, lice, bugs and the like, and is simple to produce, high in safety performance, free from any toxic and side effect, low in price, capable of achieving the purpose of treating both symptoms and root causes for treatment on skin rash, and suitable for majority of people.