Medical composition for treating diabetic nephropathy

The invention relates to a medical preparation and particularly relates to a medical composition for treating chronic diabetic nephropathy. The medicine is formed by an effective component and pharmaceutically acceptable auxiliary materials, and is characterized in that the effective component is an aqueous extract which is obtained by following raw materials by weight percent: 30-45% of astragalus mongholicus, 10-25% of radix rehmanniae recen, 10-25% of salvia miltiorrhiza, 10-25% of Chinese yam and 5-10% of licorice roots. The medical composition disclosed by the invention has specific effects and great power and improves the effect of treating the diabetic nephropathy.