Application of rhein or rhein compound-arginine complex in preparation of medicines for treating diabetic vascular complications

The invention relates to an application of a rhein-arginine complex in the preparation of medicines for treating diabetic nephropathies. The medicines for treating diabetic nephropathies are medicines for improving tiny amounts of proteinuria, creatinine and non-protein nitrogen. The medicines are novel medicines having a good safety, have better medicine effects than traditional treatment medicines and treatment methods, and allow the examples of a traditional Chinese medicinal super-molecule technology in the reconstruction of important effective components to be started and the researches and applications of the super-molecule technology in traditional Chinese medicines innovated medicines to be enlarged. The rhein-arginine complex is called rhein-arginine for short, is a new crystalline compound, and releases rhein and arginine after the rhein-arginine enters a body; and the dissolvability of rhein is changed, and the bioavailability is improved; the stability is good; a rhein parent compound is endowed w