The invention discloses an external traditional Chinese medicine composition for treating conventional psoriasis, and relates to the technical field of traditional Chinese medicine compositions. The external traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 10 parts of radix rehmanniae, 10 parts of radix scrophulariae, 10 parts of radix sophorae flavescentis, 10 parts of radix salviae miltiorrhizae, 15 parts of fructus psoraleae, 10 parts of cortex moutan radicis, 10 parts of cortex dictamni, 3 parts of radix ginseng, and 4 parts of bighead atractylodes rhizome. The external medicine wine for treating conventional psoriasis prepared by the traditional Chinese medicine composition has the advantages that the external medicine wine is used for treating the conventional psoriasis for more than 10 years in clinical application; after the medicine wine prepared by the conventional alcohol soaking method is used for treating 252 patients by three treatment courses, the healing rate reaches 87%, the obvious effective rate reaches 91%, and the effective rate reaches 96%; by using an extracting promoting agent, the extracting speed of medicine effect components is obviously accelerated, the content of medicine effect components in the medicine wine is increased, the medicine wine quickly takes effect, and the healing time is short.