The invention discloses a traditional Chinese medicine composition for treating rheumatic skin itching and a preparation method thereof. The traditional Chinese medicine composition is characterized by being prepared from the following medicinal materials in parts by weight: 9-21 parts of bigleaf fig leaf, 9-21 parts of tuber fleeceflower stem, 6-18 parts of cortex dictamni, 10-30 parts of beautiful sweetgum bark, 9-21 parts of melochia corchorifolia, 1-7 parts of brunon larkspur herb, 4-16 parts of flaxseed, 1-9 parts of burmann cinnamon leaf, 4-16 parts of peristrophe, 9-21 parts of hance brandisia herb, 10-30 parts of stellaria yunnanensis, 10-30 parts of codonopsis convolvulacea, 2-14 parts of schisandra propinqua, 9-21 parts of platycladi seed, 2-10 parts of desert asparagus and 2-14 parts of fructus terminaliae billericae. The traditional Chinese medicine composition disclosed by the invention is high in effective rate and reliable in curative effect and can avoid relapse after healing when being used for treating rheumatic skin itching.