The invention relates to a Chinese traditional medicine and a preparation method thereof, in particular to a pure Chinese traditional medicine preventing preparation which can effectively treat outdated, superficial, and atrophic gastritis, ulcer, edema, and acute and chronic gastroenteritis, hepatocholangeitis, and malignancy, and can improve the immunity of the patients, and a preparation method thereof. The herbal preparation is composed of more than 100 pure Chinese traditional medicines according to the proportioning by weight: dzho milk made calcite, zuota, jade, coral, pearl, tabasheer, saffron, clove, nutmeg, cardamom, Fructus Tsaoko, bezoar, Phytolacca acinosa, yellow corydalis, iris, Panax pseudoginseng, coriander, rutabaga, double-blossom groundsel, red sal ammoniac, purple sal ammoniac, Sikkimese rock astragalus root, stenophyllous ground touching plum, Tibetan arris vegetable, Himalayas red Jessamine, caltrop, Nangjuguique, veronica, etc. The preparation method includes six procedures of crushing, mixing, making pill, polishing, and packaging. The Chinese traditional medicine of the invention has notable curative effect, simple medicament form, and simple production process, and is worthy to be popularized and applied.