The invention discloses a dietary composition suitable for pregnant women with pregnancy combined with hepatitis and a preparation method thereof. The composition comprises the following components: maltodextrin, resistant starch, concentrated whey protein, soybean protein isolate, glutamic acid, ademetionine, vegetable oil powder, MCT oil powder, soybean phospholipid powder, omega-3 fatty acid, vitamin A, vitamin D3, vitamin E, vitamin K1, vitamin B1, vitamin B2, vitamin B6, vitamin B12, folic acid, nicotinic acid, vitamin C, sodium, potassium, iron, calcium, magnesium, chlorine, phosphorus, zinc, iodine, selenium and pectin. The dietary composition prepared by the invention is used for the pregnant women with pregnancy combined with hepatitis, has reasonable nutrient composition collocation and synergistic effect, meets the special nutritional requirements of the pregnant women with hepatitis, and has significant effects on improving the nutritional state of the pregnant women with hepatitis, ensuring the fetal nutrition supply basis, reducing the liver burden in the pregnancy period and improving the liver inflammatory state.