Animal liver is an important metabolic organ of animals and is rich in nutrients such as high quality protein, cholesterol, iron, zinc, phosphorus, etc. Pig liver has the effect of nourishing the liver and eyes, iron and blood, which helps to improve diseases such as anemia and night blindness caused by liver malfunction. Pig liver is warm in nature and sweet and bitter in taste, which helps to nourish the liver, nourish the blood and promote physical development. In addition, it is rich in vitamin A and vitamin C, which help to brighten the eyes, correct vision, relieve night blindness, as well as anti-fatigue and antioxidant. However, eating large amounts of pig liver can lead to vitamin A accumulation may cause toxic reactions such as nausea, vomiting and drowsiness in patients. In addition, it is important to note that long-term and large consumption of pork liver may cause high cholesterol, which increases the risk of cardiovascular disease. Although pig liver contains trace elements of iron, it is an ideal food source for iron supplementation and correction of iron deficiency anemia. However, as a site of metabolism, liver may contain toxic residues or unintentionally adulterated pesticides and other toxic substances in pig feed, so it needs to be thoroughly cleaned and cooked before consumption to prevent parasites, bacterial infections and other adverse conditions such as poisoning, which may endanger patients’ health.