A rational, simple convenient green aqueous methodology is described for sustainable fabrication of ultrasmall platinum nanoparticles (Pt NPs) by exploiting the phytochemicals present in M. pudica leaves extract as both a reducing agent as well as a stabilizing agent. Transmission electron microscopy analysis confirms the formation of ultrasmall spherical Pt NPs with a narrow size distribution and an average diameter of similar to 1.4 nm. The ensuing Pt NPs displayed significant direct aqueous phase conversion of glucose to levulinic acid and formic acid selectively under mild conditions and a lack of auxiliaries. An increase in the yield of levulinic acid with increases in temperature was also proposed. In addition, excellent catalytic decomposition of hydrogen peroxide by the as-synthesized Pt NPs is well-ascertained. The particle demonstrates peroxidase mimicking nanozyme behavior. Our work provides an alternative podium of environmentally friendly dean energy production and a novel chemopreventive agent for biomedical purposes.