The invention belongs to a traditional Chinese medicine composition for treating diabetes and a preparation process thereof. The traditional Chinese medicine composition is prepared from the followingmaterials in parts by weight: 1-5 parts of coptis chinensis, 9-15 parts of radix puerariae, 5-11 parts of salvia miltiorrhiza, 5-7 parts of semen thlaspi, 0.2-0.6 parts of resveratrol, and 0.5-1.2 parts of taurine. The traditional Chinese medicine composition has the advantages of being convenient to take and having a good effect for preventing and treating diabetes, hyperglycemia and other related symptoms.