The invention relates to a Chinese herbal medicine composition for treating cancer, mainly prepared from the following medicinal raw materials: wisteria gallnut, water caltrop, paris polyphylla, raw arisaema root, leech, brucea fruit, dried toad, rhizoma pleionis, centipede, pangolin scales and scorpion. The medicament provided by the invention is a hereditary secret formula of the inventor, and has the functions of detoxifying, promoting the subsidence of swelling, alleviating pain, promoting blood circulation by removing blood stasis, softening and resolving hard mass, removing dampness through diuresis, expelling toxin, strengthening the body resistance, eliminating the pathogenic factor and enhancing the body immunity; and because the raw materials are all Chinese herbal medicines and comprise plenty of components, the proportion is unique and proper, the Chinese herbal medicines are mutually synergetic and the drug effects are fully played, the medicament is suitable for a wide range of patients, is effective on various cancers, and has especially obvious effects on brain cancer, liver cancer, lung cancer and stomach cancer. The medicament provided by the invention has a simple preparation method, convenience in treatment and operation and low treatment cost, can be taken for treatment at home under the guidance of doctors without hospitalization, and is painless and uncomplicated in the treatment process. According to statistics of cases, the effective rate is 100%, the cure rate of early and middle cancer is above 90%, and patients with terminal cancer can survive for 5-10 years.