Polymer-based nanocomposite (NCs) with high dielectric constant and low-loss factor have remarkable applications in light emitting and energy storage devices. Flexible sheets of polymer-based zinc oxide silica (PB-ZnO-SiO 2 ) NCs are synthesized by co-precipitation method. The development of ZnO and SiO 2 planes confirms the synthesis of polycrystalline PB-ZnO-SiO 2 NCs. Peak intensity of ZnO planes is decreased with increasing wt.% of SiO 2 nanofillers. Surface morphology of synthesized PB-ZnO-SiO 2 NCs is associated with increasing wt.% of nanofillers. EDX spectrum confirms the presence of C, O, Zn and Si in the synthesized sheets. FTIR analysis confirms the presence of chemical bounding between the involved elements. Above 450 o C, the weight loss of S-1 is found to be 90.42% which is decreased to 49.32% for sample S-6. Dielectric properties like dielectric permittivity (13.71) with low loss factor (0.025), impedance (Z′=0.16 MΩ) and large AC conductivity (19.92 mS/m) are observed for sample S-6. The values of dielectric constant, low loss factor, low impedance and high AC conductivity of S-6 are 5.11, 0.53, 0.029 and 2.98 times higher than the value of S-1 respectively. These finding confirm that the synthesized flexible sheets are promising candidates for better light emitting and energy storage devices at high temperature.