Pure and doped WO3-x nanoparticles were prepared by facile microwave irradiation method and investigated for strong photocatalytic activity due to the great importance of oxygen vacancies (V0). In the present study, pure and "Fe (~3wt.%)" doped WO3-x nanoparticles and their crystalline nature were evaluated using powder X-ray diffraction (XRD). Bandgap analysis on W17O47 has band gap values due to the movement of oxygen vacancies. The morphological nature of the prepared products was observed by FE-SEM analysis. The observed photocatalytic behavior of the prepared compounds under visible light irradiation and the corresponding efficiency was found to be more than 50%.