Thrombocytopenia in pregnancy is not uncommon; according to large-scale case statistics, 6.6-11.6% of pregnant women will have platelets <150*109/L during pregnancy and only 1% will have platelets <100*109/L. The causes of thrombocytopenia in pregnancy are: gestational thrombocytopenia, pre-eclampsia, HELLP syndrome, acute fatty liver during pregnancy, primary immune thrombocytopenia, drug-induced thrombocytopenia, antiphospholipid syndrome, viral infection, bone marrow disease, nutritional deficiency, hypersplenism, systemic lupus erythematosus, thrombotic thrombocytopenic purpura, diffuse intravascular coagulation, etc., pseudovascular hemophilia type IIb, congenital thrombocytopenia, etc. The main task of the physician is to actively search for the cause of thrombocytopenia, evaluate the risk of thrombocytopenia for the pregnant woman and the fetus, and decide whether to give the necessary interventions. Once thrombocytopenia is detected in the course of pregnancy, a specialist examination should be carried out promptly in the hematology department. On the one hand, the cause should be actively searched for, and on the other hand, the dynamic changes in platelets should be monitored frequently to decide on further diagnostic and therapeutic measures.