The invention relates to a traditional Chinese medicine composite with function of treating renal injury caused by cis-platinum, as well as a preparation method thereof. The composite is prepared from the following active pharmaceutical ingredients in parts by weight: 700 parts of radix rehmanniae recens, 400 parts of whitish honey, 200 parts of poria and 100 parts of radix ginseng. The preparation method comprises the following steps: accurately weighing 700 parts of radix rehmanniae recens, 400 parts of whitish honey, 200 parts of poria and 100 parts of radix ginseng; soaking radix rehmanniae recens, poria and radix ginseng with 8-fold water for 30 minutes, performing heating reflux for 4 hours, filtering and collecting a filtrate; then adding 8-fold water into filtering residues, performing heating reflux for 3 hours, filtering and collecting a filtrate; combining the two filtrates, and adding whitish honey; heating and concentrating until the heat density is 1.4kg / L (80DEG C), thus obtaining the traditional Chinese medicine. Animal experiments verify that the traditional Chinese medicine is stable in curative effect on the renal toxicity caused by cis-platinum chemotherapy, and has no influence on the cis-platinum chemotherapy effect.