The invention is a medicine for treating nephropathy and a preparation method thereof. It is a medicament made of the following raw materials in weight ratio: 100-300 parts of Shijiao grass, 75-225 parts of kidney tea, 50-150 parts of Cortex Phellodendri, 50-150 parts of Imperata cocos, 50-150 parts of Poria cocos, 50-150 parts of Atractylodes macrocephala, and honeysuckle 25-75, Astragalus 50-150, Licorice 50-150, Rush 25-75, Bamboo Leaf 25-75, Alisma 50-150. When the present invention treats kidney disease (glomerulonephritis), Western medicine should combine traditional Chinese medicine treatment according to the different stages of hormone therapy according to the difference of the condition, which can not only reduce the adverse reaction of hormone, but also increase the curative effect. For symptoms such as backache, dizziness, tinnitus, hot hands, feet, dry mouth and throat, red tongue without coating, deep and thready pulse or thready pulse, the medicine of the present invention has definite curative effect on this disease, can promote the secretion of adrenal cortex in the body and relieve hormone withdrawal. Reduction syndrome, can reduce withdrawal rebound phenomenon and help consolidate the curative effect. The medicine of the present invention also has antipyretic, anti-inflammatory, antibacterial and antiviral effects.