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In the present work a new type of benzoxazine was synthesized using caproamine with cardanol and their molecular structure was characterized by FTIR and NMR spectroscopy. The graphene reinforced epoxy-polybenzoxazine nanocomposites was prepared by incorporating varying weight percentages of graphene and benzoxazine to epoxy resin. Data obtained from mechanical study infer the significant improvement in the values of tensile strength, impact strength and flexural strength of the composites reinforced with different weight percentages of benzoxazine and graphene. The values of dielectric constant of composite samples are appreciably enhanced and are higher than that of neat epoxy matrix.Data from SEM, TEM and XRD ascertain the existence of homogeneous distribution of graphene in the composites. Data obtained from thermal, mechanical, dielectric and surface free energy studies infer that 20 wt% Bz-g reinforced composites possesses better properties than those of neat epoxy matrix and other weight percentages of composites.