The invention discloses a Chinese medicine for treating phthisis and a preparation method thereof. The Chinese medicine for treating the phthisis consists of the following Chinese herbal medicines by weight: 1 to 15 grams of Indian buead, 1 to 15 grams of lily, 1 to 15 grams of adenophora, 1 to 15 grams of sessile stemona root, 1 to 15 grams of cinnamomvine and 1 to 15 grams of bletilla. The preparation method comprises the following steps of: grinding the raw materials in the weight ratio into powder, and mixing uniformly; and sieving to prepare Chinese medicinal powder, putting the Chinese medicinal powder into a container, blending with cold water to form paste, and stewing in mode of not directly contacting water for 10 to 15 minutes for eating directly. Compared with the conventionaltreatment method, the Chinese medicine has the characteristics of short treatment period, quick response, low cost and no side effect, and other medicaments are not needed in the treatment process.