Postpartum hemorrhage can be prevented by administration of oxytocin. However, oxytocin electrostimulator corset was needed to keep uterus contracting effectively because of relatively short half-life of oxytocin. A quasiexperimental research design with time series was conducted at Gunung Sari Health Center, West Lombok, Indonesia on 40 giving birth women by consecutive sampling technique. The study objective was to determine oxytocin electrostimulator corsets effect on 24 hours postpartum maternal blood volume. There were differences in the average blood volume in 6 hours postpartum, 12 hours postpartum, 18 hours postpartum, 24 hours postpartum and total blood volume in 24 hours postpartum between control and intervention group (p<0.05). However, the average bleeding volume was no difference between stage III and 2 hours postpartum. The use of oxytocin electrostimulator corset can reduce maternal blood volume within 24 hours postpartum. This research was expected as reference for the postpartum hemorrhage prevention.