The present study focuses on the electrochemical performance of PEO/PMMA blended nanocomposite solid polymer electrolytes [BNSPE] with Cadmium bromide (CdBr₂) salt and Cerium oxide (CeO₂) nanofiller. Thin films of blended nanocomposite solid polymer electrolytes [BNSPE] were signalised by distinct way of working in characterization studies such as X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), UV Visible Spectroscopy and Scanning Electron Microscopy (SEM). The X-ray diffraction (XRD) have divulge the origination of an amorphous structure in the case of blended nanocomposite solid polymer electrolyte [BNSPE] system and the particle size were premeditated by using Debye-Scherrer equation. The Fourier transform infrared spectroscopy (FTIR) exploration were carried out to diagnosis the molecular interactions taking place within the blended nanocomposite solid polymer electrolyte [BNSPE] system and optical analysis was accomplished by UV spectroscopy whereas Scanning electron microscopy (SEM) investigation has authorised the identification of the interaction of CeO₂ nanofiller amalgamated with blended polymer electrolytes exhibiting an ameliorate amorphicity. The aim of present work is to be aware of the significance of CeO₂ nanofillers with the blended nanocomposite solid polymer electrolyte [BNSPE] system towards recognition of an appreciable ionic conduction.