The invention discloses a method for establishing a non-alcoholic fatty liver disease combined with viral hepatitis mouse model. The method comprises the steps that high-fat feed is used for feeding a C3H/HeN small mouse for 12 weeks, the body weight, the liver weight, transaminase, the glucolipid metabolism index and liver histological change of the small mouse are observed, and a non-alcoholic fatty liver disease small mouse is cultivated. Then 10 PFU of MHV-3 infected mice are selected, and the survival rate, the liver histology and intrahepatic virus replication of the infected mice are observed, so that the non-alcoholic fatty liver disease combined with viral hepatitis mouse model similar to a human disease process is established. The established model provides a forceful tool for virus dynamics, immunological changes and prevention and control measures systematically studying non-alcoholic fatty liver disease combined with viral hepatitis.