The invention discloses a medicine for treating cough variant asthma. The medicine comprises 8-12 parts of momordica grosvenori, 4-8 parts of radix polygonati officinalis, 9-15 parts of radix astragali preparata, 3-7 parts of indigo naturalis, 4-8 parts of blackberry lily, 4-8 parts of rhizoma pinellinae praeparata, 4-8 parts of radix stemonae, 6-12 parts of tussilago farfara, 4-8 parts of aster,0.8-1.2 parts of as arum, 8-12 parts of earthworm, 7-11 parts of radices stellariae dichotomae, 8-12 parts of smoked plum, 4-8 parts of radix saposhnikoviae, 8-12 parts of schisandra chinensis, 4-8 parts of radix pseudostellariae, 13-17 parts of rhizoma phragmitis and 13-17 parts of cogongrass rhizome; the medicine is beneficial to improving immunity, clearing heat, removing toxicity, clearing throats, relieving a cough, resisting allergic and preventing recurrence, has good medicine flavor, and is convenient to drink. In a word, the formula is reasonable in compatibility of medicines and is an effective prescription for taking temporary solution and effecting a permanent cure as well as treating both principal and secondary aspects of cough variant asthma. Tests show that the effective rate is up to 96.7%, no dependency or rebound phenomenon caused by drug withdrawal are generated, the medicine not only can tonify the lung and benefit qi as well as relieve a cough and asthma, but also can resist allergy and prevent recurrence, and compared with therapy by western medicines, the medicine provided by the invention has certain advantages.