The invention relates to a preparation for treating cancer and the preparation method thereof, which is formed by panax, astragalus, ganoderma lucidum, myrobalan, Chinese chive seed, hedyotis diffusa, scullcap, smilax glabra rhizome, subprostrate soplhor root, glycyrrhiza, indico naturalis and aloe, applicable for early, middle and terminal cancer patients, with effects of anticarcinogenesis and effective strengthening the physical fitness of patients. The said preparation has effects of adjusting incretion, assisting healthy energy, enhancing immunity of the patients; eliminating the sick tendency, direct killing cancer cells; regulating stomache qi to improve the function of spleen and stomach, cleaning up the turbid qi to eliminate the sick tendency in the viscera; clearing heat and detoxicating, activating blood circulation to dissipate blood stasis, softening and resolving hard masses to perish tumour, control tumour, improve surgical treatment and remote therapeutic effect; lessening side effect, improving symptom, enhancing quality of existence and prolonging the suvival time.