Objective To observe the pharmacological effect of Jiaweisinisan (JWSNS) on alcohol liver diseases. Methods Feeding Wistar rats with alcohol induced the alcohol liver diseases model. Then JWSNS was used on the alcohol liver diseases model to observe the histological variation of liver and detect the effect on the liver’s expression of SOD, GSH-PX, CAT and MDA. At the same time, Xiaochaihu granule group was used as control. Results On the alcohol liver diseases model group processed with JWSNS, obvious decrease of pathological injury with expression of MDA in liver was observed, while a markedly increased expression of SOD, GSH-PX and CAT was detected. Conclusions JWSNS can prevent liver cells from peroxided injury by alcohol.