The invention relates to a traditional Chinese medicinal decoction for treating systemic lupus erythematosus, in order to effectively solve the problems of Western medicine which is remarkable in adverse reaction and is easy to cause disease reoccurrence after being stopped; the technical solution is as follows: the decoction is prepared from the following medicinal raw materials in parts by weight: 10-20 parts of dried rehamnnia root, 5-20 parts of polygonum multiflorum, 10-25 parts of teasel root, 5-15 parts of eucommia bark, 5-20 parts of sweet wormwood, 5-30 parts of roasted tortoise plastron, 5-30 parts of turtle shell, 5-20 parts of moutan bark, 10-30 parts of sargent gloryvine stem, 10-40 parts of cornu bubali and 10-30 parts of herba centellae, and the decoction is prepared by the following steps: mixing the medicinal raw materials, immersing the medicinal raw materials in water, decocting twice, filtering and combining filtrates of two times. The traditional Chinese medicinal decoction disclosed by the invention has functions of nourishing liver and kidney, nourishing yin and expelling pathogenic factors, removing blood stasis and eliminating toxin, and the traditional Chinese medicinal decoction is low in cost, free from remarkable toxic and side effects and relatively high in curative rate, being an innovation in medicines for treating systemic lupus erythematosus.