The invention discloses external traditional Chinese medicine powder for curing psoriasis, which is characterized by comprising the following medicine materials by weight percent: 4-7 percent of lightyellow sophora root, 1-3 percent of realgar, 8-11 percent of calcined alum, 5-7 percent of amur cork-tree bark, 3-5 percent of borneol, 3-5 percent of borax, 1-3 percent of draconis resin, 5-7 percent of red lead, 3-5 percent of calomel, 3-5 percent of cicada slough, 0-3 percent of cantharis, 3-5 percent of mercury, 3-5 percent of dittany bark, 3-5 percent of ginger powder, 3-5 percent of cynanchum auriculatum, 3-5 percent of pig nail, 5-8 percent of pawpaw, 3-5 percent of vermilion, 3-5 percent of soap pod, 3-5 percent of sulfur, 4-6 percent of nidus vespae, 3-5 percent of devaricate saposhnikovia root and 3-5 percent of natural indigo. The external traditional Chinese medicine powder for curing psoriasis has higher healing rate, more rapid healing speed, low cost, no toxic side effect and no recrudescence.