Uterine torsion in pregnancy is a rare but very dangerous complication. The diagnosis of uterine torsion is often difficult due to the rare occurrence of this complication and unspecific clinical symptoms. A pregnant woman of 25gestational week came to our hospital with a severe abdominal pain, very strong uterine contraction and dead fetus. Urgent cesarean section surgery is performed with a diagnosis of severe placental abruptionand the malformation of uterus didelphys. During the caesarean section, we found the pregnant uterus on the right siteand the right appendage twisted 180 degrees to the left. The patient was untwisted, undergone the incision in the low part of the uterus to take the dead fetus out, and had a subtotal hysterectomy and rightoophorosalpingectomy after unsuccessful attempt to preserve the uterus. The postoperative condition was stable and the patient was discharged after 5 days