The invention discloses a traditional Chinese medicinal treatment liquid for treating erosive psoriasis, and belongs to the field of pharmacy. The traditional Chinese medicinal treatment liquid for treating erosive psoriasis is prepared through boiling 8-10% of fructus cnidii, 8-10% of Nux Vomica, 8% of radix paeoniae rubra, 7% of Amur Corktree Bark, 9% of Lithospermum erythrorhizon, 8% of Herba Schizonepetae, 7% of sophora flavescens, 6% of Divaricate Saposhnikovia Root, 9% of honeysuckle flower, 8% of unprocessed licorice root, 7% of radix bupleuri, 6% of Dictamnus dasycarpus and 7% of Atractylodes lancea in a proper amount of water. The treatment liquid has good efficacy of qi and blood regulating, yin and yang balancing, channel dredging, channel warming and cold dispelling, wind and dampness dispelling, heat clearing and detoxifying, swelling eliminating and blood stasis removing, vein relaxing and itch relieving, nutrition enhancing and tissue regeneration promoting, and toxin dispelling and speckle fading, and is specially used for externally washing erosive psoriasis patients.