Medicament for treating cancer and preparation method thereof

The invention provides a medicament for treating cancer, which consists of the following components in part by mass: 2 to 5 parts of polygala arillata, 20 to 50 parts of pork and 400 to 700 parts of water in a medicament I; and 5 to 10 parts of longhairy antenoron herb and 500 to 1,000 parts of rice washing water in a medicament II. The medicament I is obtained by decocting the polygala arillata and the pork in the water till the medicinal skin of the polygala arillata is sandy; and the medicament II is obtained by decocting the longhairy antenoron herb in the rice washing water till the water is boiling. The medicament can cut off the nutrition for growth of cancer cells in 25 days after administration so that the cancer cells are not grown any more and the disease is controlled; and the medicament can achieve the effect of healing after continuous administration.