In the modern world, sustainable development is one of the most critical matters that society must address. The hunt for innovative and sustainable solutions has been prompted by the need to lessen our carbon footprint and safeguard resources for future generations. Nano particle prepared via green route is the solution for above mentioned social issue. In order to prepare sized-controlled Strontium titanate nanoparticle, a perovskite material for energy storage devices, we used green combustion with citrus-limon as the fuel. PXRD and SEM tools were used to analyze the structural morphology of the as prepared NP’s. Narrow particle size, with blue shift in absorption edge suggest that, method of preparation is a good choice to produce SrTiO3 NP which has enhanced dielectric constant values than other reported method which make use of these particles in Energy storage devices.