There is no specific time for fatty liver to develop into liver cancer, not all fatty liver will develop into liver cancer, and the chance of simple fatty liver developing into liver cancer is very small. Fatty liver is a clinical syndrome characterized by diffuse steatosis of liver cells caused by various reasons, and alcoholic fatty liver is the most common. Alcoholic fatty liver disease is the most common. As the disease progresses, it can gradually develop into alcoholic hepatitis, liver fibrosis, liver cirrhosis, liver cancer and liver failure. If accompanied by obesity, bad lifestyle habits (such as lack of exercise, smoking, alcoholism, late night, etc.), metabolic syndrome, etc., fatty liver disease is serious and progresses faster. Abstinence from alcohol can slow down the progression of liver disease and reduce the occurrence and development of cirrhosis. Non-alcoholic fatty liver disease progresses slowly, and the chance of simple fatty liver disease developing into cirrhosis and liver cancer is very small. People with fatty liver should pay attention to reasonable diet, increase exercise, quit smoking and limiting alcohol, and avoid staying up late in the night. Regular medical checkups should be conducted to screen for the occurrence of liver cancer and other diseases.