The present invention relates to a lung-clearing expectorant combination of a medical food and the preparation method thereof, wherein the medical food mainly comprises components with the prescribed ratios including Scutellaria, Rhizoma Pinelliae, Snakegourd Seed, Rhizoma Arisaematis, orange skin, almond, Citrus Aurantinum, Caulis Bambusae, Ejiao, and Reed Rhizome, and has good function to digest the accumulated foods, eliminate the heat and stop the sputum, downward regulate the Qi and widen the central, with especially the significant effect to treat the symptoms of emphysema including cough, asthma, chest distress, and dyspnea, additionally, the present invention can also be adopted as a routine medical food for health care without any side effect, with convenient taking, better social and economical benefits.