Not all pregnant women need to inject enoxaparin sodium, the application of enoxaparin sodium during pregnancy is mainly used for the treatment of recurrent miscarriage, fetal growth restriction, preeclampsia and other diseases. The molecular weight of enoxaparin sodium is 3500~5500 daltons, it has safe and exact anticoagulant effect, it does not pass through the placenta, it is widely used in obstetrics, it is often used in patients with recurrent miscarriage caused by easy embolism, antiphospholipid syndrome, venous embolism thrombosis, it is also used in the treatment of fetal growth restriction, preeclampsia, amniotic fluid hyponatremia, intrahepatic cholestasis in pregnancy, and so on. The common adverse reactions of enoxaparin sodium include rash, hematoma at the injection site, bleeding, thrombocytopenia, etc. During use, attention should be paid to observing whether there is a tendency to bleed or not, and if there is bleeding, the cause of bleeding should be identified immediately and appropriate intervention should be given. When using enoxaparin sodium during pregnancy, it should be applied under the guidance of a doctor, do not self-medicate.