The present invention relates to a pharmaceutical composition for preventing and treating an inflammatory disease, including a mixture of extracts from Trachelospermi Caulis and Paeonia Suffruticosa Andrews as an active ingredient and method for preparing the same. Also, a quasi-drug composition, a health functional food composition and a cosmetic composition, all based on the mixture, are provided for preventing or improving inflammation. In addition, the present invention relates to a method for treating an inflammatory disease by administering the pharmaceutical composition to a subject suspected of having the inflammatory disease. Containing the extract mixture, the composition exhibits excellent anti-inflammatory activity and edema-suppressing activity, compared to individual extracts, and thus can be applied to the prevention, treatment or improvement of an inflammatory disease. As natural materials, the extracts can be used as a safe therapeutic relatively free of fungal infection or other side-effects, compared to synthetic medicines. In addition, the known physiological activities of the extracts from Trachelospermi Caulis and Paeonia Suffruticosa Andrews including antibacterial activity, bone reinforcement, antiphlogistic activity, blood nourishment, vigoration, etc. may bring about a synergistic effect on the prevention, treatment and improvement of an inflammatory disease.