The invention relates to the technical field of traditional Chinese medicines, in particular to a medicine for treating lung diseases. The medicine comprises the following raw materials in parts by weight: 3-20 parts of bletilla striata, 3-30 parts of radix stemonae, 3-15 parts of adenophora stricta, 3-15 parts of codonopsis pilosula, 3-20 parts of colla corii asini, 3-20 parts of radix asparagi, 3-30 parts of bulbus fritillariae ussuriensis, 3-20 parts of astragalus membranaceus, 3-20 parts of radices trichosanthis, 3-30 parts of selfheal, 1-15 parts of paris polyphylla, 1-30 parts of sculellaria barbata, 1-30 parts of hedyotis diffusa, 1-15 parts of liquorice, 1-20 parts of angelica sinensis, 3-30 parts of rhizoma anemarrhenae, 3-30 parts of lily, 3-20 parts of radix rehmanniae, 3-30 parts of herba houttuyniae, 2-10 parts of tokay gecko, 3-20 parts of platycodon grandiflorum and 3-30 parts of radix ophiopogonis. The medicine has the beneficial effects that according to a traditional Chinese medicine compatibility principle, the medicine can be used for effectively treating diseases such as pulmonary tuberculosis, pulmonary bulla, pulmonary nodule, hydropleural effusion, hydropneumosis and cough, and is good in treatment effect, low in treatment cost and free of toxic and side effects.