We demonstrate a simple, straight forward, clean-green, single pot approach for the synthesis of silver nanocomposite by Macaranga denticulate plant extract. The biosynthesis ofnanocompositehas been proposed as a cost-effective and environmentally friendly alternative to chemical and physical methods. Plant-mediated synthesis ofnanoparticlesis a green chemistry approach that connects the nanotechnology with plants. Silver nanocomposite have been found to have interesting properties in the field of medicine, particularly against fungal and viral infections, inflammation, angiogenesis, platelet aggregation and cancer cells. The formation of silver nanocomposite was characterized by Ultra-Violet Visible Spectroscopy and high resolution Transmission Electron Microscopy. The Selected Area Electron Diffraction pattern showed clear and uniform lattice fringes implying that the synthesized nanoparticles are highly crystalline and correspond to face centered cubic structure. Stability of the nanoparticles was measured by zeta potential measurement. The surface plasmon resonance spectroscopy of silver nanoparticles was observed at 420-430 nm. Atomic Force Microscopy was used to characterize surface morphology of the synthesized silver nanoparticles. X-ray Diffraction Technique was utilized to characterize the particle size and crystalline nature of the particle. The most intense peak (plane 111) was analyzed to determine the particle size of the nanoparticles, which was found to be 30 nm. Functional groups present on the surface of biosynthesized silver nanomaterial were analyzed by Infra-Red Spectroscopy. The characterized Silver nanoparticles were utilized as chemical sensor to detect the decomposition of H2O2