The invention discloses a semen cassiae, fructus lycii and glossy privet fruit oral solution with functions of tonifying liver and reducing fat. The semen cassiae, fructus lycii and glossy privet fruit oral solution is prepared by adopting the steps of respectively weighing Chinese medicinal herbs: 30 parts of semen cassia, 30 parts of fructus lycii, 30 parts of glossy privet fruit, 20 parts of polygonum multiflorum thumb, 20 parts of gynostemma pentaphylla, 20 parts of raw hawthorn, 20 parts of capillary artemisia, 10 parts of radix curcumae and 10 parts of rhizoma alismatis; and decocting the Chinese medicinal herbs together according to a conventional method, and densely decocting into an oral solution of 2g dried medicinal herbs / ml. A taking method is as follows: the semen cassiae, fructus lycii and glossy privet fruit oral solution is taken twice, 20ml per time. One month is a course of treatment, and the semen cassiae, fructus lycii and glossy privet fruit oral solution is generally taken for three courses of treatment. Fatty, sweet, stodgy and pungent foods are contraindicated in a taking process. The semen cassiae, fructus lycii and glossy privet fruit oral solution has the advantages of low Chinese medicinal herb price, and is convenience to take and process, and has a remarkable treatment effect on non-alcoholic fatty liver disease and hyperlipoidemia. Meanwhile, according to the characteristic of liver deficiency, the semen cassiae, fructus lycii and glossy privet fruit oral solution is suitable for all types of syndrome of the traditional Chinese medicine, is capable of recovering the function of the liver to protect the liver and is capable of removing pathological products to achieve the treatment purpose.