The invention discloses a Chinese patent drug prepared by taking Chinese medicinal herbs as raw materials, particularly discloses a medicament for treating a stomach illness. A formula of the medicament comprises the following materials by weight: 8-12 grams of endothelium corneum gigeriae galli, 18-22 grams of fructus amomi, 8-12 grams of syzygium aromaticum, 8-12 grams of hoodshaped alocasia rhizome, 18-22 grams of cinnamons, 18-22 grams of alpiniahenryik schum, 8-12 grams of radix aucklandiae, 18-22 grams of rhizoma zingiberis, 18-22 grams of galangal, 28-32 grams of codonopsis pilosula and 8-12 grams of common fennels. A preparation method comprises the following steps of: cleaning the Chinese medicinal herbs, frying to be dry, mixing and grinding; then sieving through a fine screen to prepare powder, and bagging. The invention enables a product to contain multiple drugs and nutrient components by adopting various Chinese medicinal herbs and a fine processing process and has the advantages of rigorous prescription, extensive medicinal herbs resource, simple process, low cost, outstanding treatment effect and effects on treating the symptoms of various stomach illnesses, thereby relieving the suffering of general patients.