The invention belongs to the field of traditional Chinese medicines and discloses a traditional Chinese medicine for radiation pneumonitis caused by malignant tumor radiotherapy and a preparation method of the traditional Chinese medicine for radiation pneumonitis caused by malignant tumor radiotherapy. Active ingredients of the traditional Chinese medicine include radix ilicis asprellae, viola acuminata, Chinese forgetmenot root, rhizoma polygonati, herba pholidotae chinensis, selaginella delicatula, perfoliote knotweed herb, northern bedstraw, fiveleaf gynostemma herb, herb of glabrous torenia, root of Chinese eriosema, poria cocos, parochetus communis buch, disporum calcaratum, mulberry fruit, angelica sinensis, picrarrhiza kurroa royle, chlorephytum capense var variegatum hort, radix asparagi, lilies, radix cynanchi, aernaria przewalskii maxim, radix ophiopogonis, radix glycyrrhizae, root of axillaryflower twistedstalk, begonia fimbristipula, tremella and rhizoma menispermi. By symptomatic treatment, the traditional Chinese medicine for radiation pneumonitis caused by malignant tumor radiotherapy has efficacies of Qi tonifying, Yin nourishing, heat clearing, detoxifying, blood circulation promoting, stasis removing, lung moisturizing, cough relieving, sputum reducing, body fluid production promoting, moistening, mind calming and nerve soothing and has the advantages of excellent absorption effects, remarkable curative effects, avoidance of toxic and side effects and clinical adverse reaction and high cure rate of radiation pneumonitis according to clinical verification.