The invention discloses a formula traditional Chinese medicine for treating dermatosis and belongs to the technical field of traditional Chinese medicines. The formula traditional Chinese medicine comprises an external main formula and an internal auxiliary formula, and has special effects on treating psoriasis, eczema, prurigo nodosa, amyloid lichen, pruritus cutanea, pityriasis rosea, neurodermatitis, rhagadia of hands and feet, contact dermatitis, tinea capitis, tinea manuum, tinea pedis, tinea corporis, tinea versicolor, dermatitis, urticaria, acne and folliculitis. In the traditional Chinese medicine science, the cause of sores and stubborn dermatophytosis is mixture of wind, phlegm fire, dampness and pathogenic toxins. The leading cause of all diseases is wind, trembling and dizziness are caused by lesions of the liver, liver qi is stagnated to generate phlegm fire, the liver transfers malignant infections to spleen, dampness is generated due to spleen deficiency, water is retained in the earth, spleen diseases are transferred to the kidney to cause kidney deficiency, yin and yang imbalance of the human body is caused, and wind, phlegm fire, dampness, pathogenic toxin and deficiency are caused and need to be treated. The medicine can be used in four seasons, has a relatively strong repairing effect on skin epidermis, dermis, subcutaneous tissue and the like, and has the effects of relieving itching and pain, removing necrotic tissue and promoting tissue regeneration, clearing heat and drying dampness, purging fire and removing toxin, cooling blood and removing freckles and the like.