It is necessary to check the blood routine of pregnant women once a month, and the blood routine of pregnant women can detect diseases in time and treat them. Routine blood test is used to detect pregnant women’s red blood cells, white blood cells, platelets, hemoglobin and other indicators of the test. It is necessary to conduct routine blood tests during pregnancy to monitor and exclude related hematologic diseases and inflammation or infections through routine blood indicators. Under normal circumstances, pregnant women’s blood routine is not very different from that of the general population. Anemia may occur when pregnant women have a decrease in red blood cells or hemoglobin, and anemia can lead to slow fetal development and other conditions. When the white blood cells of pregnant women are elevated, it may be the occurrence of infection, leukemia, etc.; eosinophilia may be the occurrence of allergies or parasitic infections, etc.; platelet decrease may suggest that there is a hematological system, such as megaloblastic anemia, aplastic anemia, idiopathic thrombocytopenia, etc., and platelet decrease will affect the coagulation function of pregnant women, and it is recommended to choose a vaginal delivery.