PURPOSE: A composition for treating atopic dermatitis, which contains plant extract is provided to prevent and treat atopic dermatitis caused by disorder of immune system. CONSTITUTION: A composition for treating atopic dermatitis comprises a Ulmus davidiana var., Cassia obtusifolia, Taraxacum platycarpum and Prunus salicina extracts which have effects of preventing and treating atopic dermatitis. A method for manufacturing the composition for preventing and treating atopic dermatitis comprises: a step of adding ten to thirty times volume of organic solvent to the Ulmus davidiana var., Cassia obtusifolia, Taraxacum platycarpum and Prunus salicina a step of isolating the extracts of the Ulmus davidiana var., Cassia obtusifolia, Taraxacum platycarpum and Prunus salicina at 10 ~ 30°C for two to five days and filtering a step of decompressing the extracts and a step of drying the resultant extract.
