The invention relates to an application of a traditional Chinese medicine composition in preparation of a medicine for treating novel coronavirus pneumonia, in particular to an application in preparation of a medicine for treating a lung-spleen qi deficiency syndrome in a clinical treatment recovery phase of the novel coronavirus pneumonia. The traditional Chinese medicine composition is prepared by compatibility of thirteen traditional Chinese medicinal materials including prepared rehmannia root, radix aconiti lateralis praeparata (black prepared aconite root), moutan bark, radix achyranthis bidentatae, salted fructus psoraleae, fructus amomi, semen plantaginis, poria cocos, salted fructus alpiniae oxyphyllae, cinnamon, Chinese yam, rhizoma alismatis, fructus rosae laevigatae and the like according to the principle of monarch, minister, assistant and guide. The medicines are used for warming kidney, absorbing qi, tonifying spleen and reducing phlegm together. Clinical test results show that the traditional Chinese medicine composition can significantly improve the traditional Chinese medicine syndrome integral of a patient in the convalescent stage of the new crown pneumonia, and has significant symptom remission rate and relatively fast symptom remission time for new crown pneumonia symptoms such as weakness, cough and the like. In addition, the composition is free of adverse drug events and good in safety.