Pharmaceutical composition with liver-protecting effect and preparation method thereof

The invention relates to a pharmaceutical composition with liver-protecting effects. The composition comprises the following substances by weight: 6-15 parts of black tea polyphenol and 2-6 parts of a Silybum marianum extract. The silymarin and black tea polyphenol with different drug effects have very clear roles in prevention and treatment of chemical liver injury from different targets and the ways of, and are complementary with each other to effectively prevent and treat chemical liver injury. The two medicines are combined to perform the efficacies of strengthening and nourishing the liver, coursing the liver, detoxifying and immunoloregulation. Tests have proved that the pharmaceutical composition provided by the invention can prevent liver injury.