The presence of thrombocytopenia during pregnancy can be a normal physiologic manifestation or a pathologic condition. Thrombocytopenia in pregnancy can be a primary thrombocytopenia in pregnancy, which is a normal physiological phenomenon in pregnancy, the degree of platelet reduction is relatively mild, this situation is generally associated with an increase in the effective blood volume in pregnancy, the concentration of blood decreases, that is, blood dilution caused by a pregnant woman’s response to the fetus, which is caused by physiological thrombocytopenia. Thrombocytopenia during pregnancy can also be a pathologic manifestation, mostly in combination with idiopathic thrombocytopenic purpura, which is a relatively obvious decline in platelets, the pathogenesis of which is unclear, and the risk of hemorrhage in this case is relatively high. Platelets are very important to the human body, participating in the important process of the coagulation mechanism, but also the role of moisturizing and nutritive capillary walls, if there is a decrease in platelets, the risk of bleeding will be significantly increased, but also prone to capillary rupture phenomenon, so it will be manifested in the skin bruise points, platelet count is reduced, and it will also increase the risk of pregnant women during delivery, which may lead to hemorrhage. In the case of hypertensive syndrome of pregnancy, if there is a significant decrease in platelets, the occurrence of the serious complication HELLP syndrome should be highly suspected. Once thrombocytopenia occurs in pregnant women, it is important to pay high attention to prevent complications.