Disclosed are a class of pharmaceutical compounds for treating liver diseases and application thereof. In particular, said pharmaceutical compounds are compounds as represented by general formula (I), optical isomers, or pharmaceutically acceptable salts thereof.The provided compounds, optical isomers, or pharmaceutically acceptable salts thereof have low toxicity and good curative effect on liver diseases, especially fatty liver. Experiments have shown that the compounds have a significant protective effect on non-alcoholic fatty liver in zebrafishes, and therefore have a good application prospect in drugs for the treatment or prevention of liver diseases, especially fatty liver, liver fibrosis, or cirrhosis.