The invention discloses a traditional Chinese medicine composition for treating chronic nephritis proteinuria, and the traditional Chinese medicine composition is mainly prepared by the following active pharmaceutical ingredients in parts by weight: 20-50 parts of raw membranous milkvetch root, 15-30 parts of pilose Asiabell root, 15-30 parts of Chinese peashrub root, 15-30 parts of raw coix seedroot, 18-30 parts of fructus forsythiae, 12-30 parts of honeysuckle flower, 18-30 parts of heartleaf houttuynia herb, 15-30 parts of spreading hedyotis herb, 9-20 parts of Szechuan lovage rhizome, 9-20 parts of tree peony bark, 15-30 parts of motherwort herb, 15-30 parts of Indian buead, 15-30 parts of corn silk and 15-30 parts of winged euonymus twig. In addition, the invention further disclosesa preparation method of the traditional Chinese medicine composition. The traditional Chinese medicine composition can combine tonification with purgation, perform warming and cooling simultaneously,effectively eliminate the proteinuria and other pathological indicators of kidneys, delay and even block the progress of chronic nephritis and realize the significant protection effect for the kidneys.