This present study was to investigate antioxidant activity and the present of phytoconstituents of the Stem bark of the plant Erythrina variegata Linn (EV) var.alba. The EV extract was prepared in 70% methanol (EVME) as well as water (aqueous) (EVAE). The antioxidant activity is investigated by in-vitro methods like reducing power, superoxide radical inhibition and hydroxyl radical scavenging method and Sodium metabisulphate (SMS) were (25g/ml) used as standard reference . The maximum percentage of inhibition shown in all activities at 100 mg/ml of EVME and EVAE, in the reducing power activity was 88.78 and 72.58% compared to standard SMS 90.67 and 89.72%, Superoxide radical scavenging, 57.58 and 54.15%, standard SMS were 63.50 and 60.10% and Hydroxyl radical scavenging activity in 1hr incubation were 58.81 and 54.70% and standard SMS 65.60 and 58.10% after 4hr of incubation reports 55.12 and 52.52% and SMS were 62.06 and 56.84% respectively. In phytoconstituents analysis the total flavonoids content was found to be 1.980.12 and 1.410.10 mg/g, total phenolic content 1100.32 and 940.91 mg/g, total antioxidant capacity 1.740.39 and 1.210.14 mg/g were reported respectively in EVME and EVAE. The total alkaloid content of EV bark was 0.72%. From our study we can concluded that the stem bark of EV var.alba has a potent antioxidant property.