The invention discloses a Chinese medicinal preparation for curing psoriasis and a preparation method thereof. The Chinese medicinal preparation is prepared by exploring folk secret prescription according to the theory and treatment principles of traditional Chinese medicine for regimen and principles of formulating prescription of traditional Chinese medicine, consists of the following Chinese medicament raw materials: pine bark, honeysuckle flower, hypericum japonicum thunb and sugar-cane, can be taken orally and applied externally simultaneously to make the medicament directly reach a focus, effectively changes the epidermis symptoms of the psoriasis, unblocks pores, improves the cell viability, adjusts internal secretion and promotes regeneration function of the skin cells and blood circulation of the skin. The Chinese medicinal preparation for curing the psoriasis has quick response, high curative effect, high cure rate and low relapse rate, cures both the symptoms and root causes, is safe and reliable, effectively strengthens the immunity of a human body, particularly has high curative effect on psoriasis vulgaris and psoriasis pustulosa and has better curative effects on arthropathic psoriasis, erythrodermic psoriasis, neurodermatitis, eczema and acne.