The exciton dynamics in nanocomposites of tin oxide (SnO2) nanoparticles with a conjugated polymer (poly (2-methoxy-5-(2’-ethylhexyloxy) 1,4-phenylenevinylene) (MEH-PPV) have been investigated by steady-state, time-resolved photoluminescence (PL) spectroscopy and cyclic voltammetry analysis. SnO2 is an air-stable, optically transparent, electrically conductive deep valance band metal oxide which is suitable as an electron-accepting material in organic photovoltaics (OPVs). Results reveals that SnO2 is an efficiency electron-accepting material in comparison with titanium dioxide (TiO2) nanoparticles. Efficiency charge separation takes places at SnO2/MEH-PPV interfaces when the polymer is excited, leading to enhancement in quenching of photoluminescence efficiency (10 %) and shortening of the measured PL lifetime. In addition, the reduction in recombination rate of MEH-PPV/SnO2 nanocomposite show that the incorporation of nanoparticles in the polymer chain reduce disorder in polymer chain. The blue-shift in the absorbance and emission maxima denotes that the process of in-situ polymerization resulted in shortening in conjugation of polymer chain. The electrochemical analysis for MEH-PPV/SnO2 nanocomposites shows increase in current density compared to MEH-PPV/TiO2 and pristine MEH-PPV. Moreover, the PL degradation experiments showed that MEH-PPV/SnO2 exhibited enhanced stability. MEH-PPV/SnO2 film attained 50% of the original intensity in ~ 10 days, while pristine MEH-PPV and MEH-PPV/TiO2 exhibited half-life of ~ 5 days when exposed to an ambient environment. The effect of TiO2 nanoparticles to stabilize MEH-PPV is though less important than that of SnO2. Thus MEH-PPV/SnO2 nanocomposite with enhanced absorbance, conductivity, stability and low bandgap formed an effective type-II band structure suitable for the photovoltaic active layer.