The invention discloses a traditional Chinese medicinal composition for treating stomach cancer and a preparation method thereof and belongs to the technical field of traditional Chinese medicines. The traditional Chinese medicinal composition for treating the stomach cancer is prepared from the following raw materials: Chinese actinidia root, garden balsam, sculellaria barbata, nidus vespae, radix ranunculi ternate, vietnamese sophora root, paris polyphylla, solanum lyratum, alkanet, fructus akebiae, realgar, cactus, Chinese rhubarb, root of three-nerved spicebush, rhizoma cyperi, pericarpium citri reticulatae viride, szechwan chinaberry fruit, bighead atractylodes rhizome, codonopsis pilosula, radix ophiopogonis, radix scrophulariae, rehmannia root, fructus aurantii, costustoot, agilawood, rhizoma nardostachyos, pseudo-ginseng, ligusticum wallichii, salviae miltiorrhizae, immature bitter orange and rhizoma cyperi. According to the traditional Chinese medicinal composition for treating the stomach cancer, all the medicinal raw materials are combined to synergistically take pharmaceutical effects of activating blood circulation to remove blood stasis, supporting the healthy energy, benefiting qi, nourishing blood and resolving harm lump; with application of the traditional Chinese medicinal composition, body immunity can be improved, circulation is improved, stomach environment can be effectively improved, and growth diffusion of cancer cells can be effectively inhibited; Meanwhile, pain of a patient is alleviated, toxic and side effects during chemoradiotherapy are reduced, quality of life is improved, and the aim of thorough rehabilitation is achieved.