The plant Oxalis corniculata L. (creeping wood sorrel) also called procumbent yellow sorrel belongs to family Oxalidaceae. It is very population perennial herb that is distributed in world wide. The leaves of wood sorrel are quite edible with a tangy taste. In this present study the methanolic extract of whole plant Oxalis corniculata L. were investigated by using DPPH scavenging test and reducing power method. The preliminary phytochemical screening was performed and the total phenolic content had been estimated. The MEOC exhibited a significant dose dependent inhibition of DPPH activity. The IC50 values of the MEOC and reference standard ascorbic acid have significant anti oxidant activity and the similar activity was shown in the other method also.