The invention provides a pure Chinese traditional medicine preparation for treating psoriasis and multiple skin diseases. The pure Chinese traditional medicine preparation is prepared from the following 21 Chinese traditional medicinal materials: honeysuckle flowers, cortex phellodendri chinensis, flos chrysanthemi indici, glabrous greenbrier rhizome, common ducksmeat herb, yam rhizome, radix rehmanniae, zaocys dhumnade and the like. The pure Chinese traditional medicine preparation provided by the invention has the effects of dispelling wind and nourishing blood, removing dampness to relieve itching, removing pathogenic heat from the blood and toxic materials from the body and supporting the healthy energy, has good treatment effects on the allergic reaction, epidermis proliferation cornification, lichenification, vascular inflammation and hair follicle and sebaceous gland blockage, such as the psoriasis (psora), leucoderma, neurodermatitis, dermatitis, eczema, urticaria, irritability, rubella, comedo, acne and verruca plana, is wide in clinical application treatment range without toxic and side effects, and can not injure the organs and functions of a human body and enhance the physique and the immunity of the human body even if being taken for a long time. A medicament prepared through a preparation method of the pure Chinese traditional medicine preparation is high in dissolution rate and higher in stability.