Abstract: The purpose of this study was to explore the capability of Moringa oleifera leaf extract in protecting rat blood against the exposure to electromagnetic field (EMF). Forty two adult white Albino male rats, weighting (150-180 g) were divided into six equal groups . The first group is the control while the second group was orally supplemented daily with (200 mg/kg) of Moringa oleifera leaves extract (MOLE) for six days. The third group was continuous exposed to EMF of 1.5mT, 50 Hz for 9 hours. The other three groups were exposed to the same EMF and Moringa extract in different ways (before, after and before and after the exposure of magnetic field). Blood samples were collected and hemoglobin extracted. The relative viscosity and conductivity were measured. Blood films were also taken for histological examination. The results showed significant increase in relative viscosity and conductivity of hemoglobin molecules. Microscopic examination of blood films showed alterations in different shapes and pale in color of red blood cells with aggregation to form rouleaux. Lymphocytes degeneration were also observed. The results of groups which treated with Moringa showed good repairing in all results. So this study concludes that impairments caused by EMF on blood can be decreased by Moringa oleifera leaf extract.