Selenium is an essential element for the growth, development and metabolism of the body. Selenium malnutrition during pregnancy may have adverse effects on pregnancy outcomes. Therefore, it is very important for pregnant women to maintain appropriate selenium nutritional status. However, at present, there is no consensus on the evaluation method of selenium nutritional status of pregnant women and the need for routine selenium supplementation during pregnancy. More and more in-depth studies are needed to provide the basis. This article reviews the effect of selenium nutrition status during pregnancy on maternal and infant outcomes, so as to provide some reference for clinical practice.