The invention discloses a drug for treating elderly abdominal distension. The drug comprises 6-14 parts of ginseng, 10-20 parts of bighead atractylodes rhizome (fried), 5-15 parts of licorice (processed with honey), 10-20 parts of rhizoma cyperi (processed with vinegar), 12-18 parts of citron, 6-14 parts of amomum fruit, 13-17 parts of elecampane, 10-20 parts of fructus aurantii (stir-baked with bran), 14-22 parts of pericarpium citri reticulatae, 25-35 parts of semen raphani (fried), 8-16 parts of medicated leaven (fried), 10-20 parts of malt (fried), 14-22 parts of hawthorn (fried), 8-16 parts of gizzard pepsin (fried), 9-15 parts of inula flower, 26-34 parts of ruddle, 5-15 parts of ginger processed pinellia, 9-21 parts of pawpaw, 9-21 parts of dendrobe, 14-26 parts of yam, 10 parts of ginger and 15 parts of jujube. The preparation method of the drug comprises the following steps: firstly, decocting ruddle in a boiler to boil, wrapping the inula flower in cloth, mixing the components, adding 3 times of water to soak the components for 30 minutes, and then, putting the components in the boiler, boiling the components through strong fire, and continuing to decoct the components for 30 minutes through slow fire, removing residues, extracting juice, continuously decocting the components for twice, mixing the decoction obtained in twice to obtain the drug. The components mutually act, thereby both curing the stomach and protecting the stomach, treating both manifestation and root cause of disease, facilitating to create gastrointestinal digestion and promoting reinforcement of gastrointestinal motility.