The synthesis of magnesium doped Tungsten oxides (Mg:WO3) nanomaterial was achieved using a simple household microwave irradiation method. In which 3 and 10 wt% magnesium chloride were used to prepare the above material. The synthesized materials were structurally and optically characterized using various techniques like X- Ray Diffraction, FTIR, UV-DRS, PL and SEM-EDAX. The X-ray diffraction confirms clearly showed the presence of crystalline Mg: WO3 particles. Further, UV-DRS and FTIR result shows the presence of Mg: WO3 nanomaterials at specific wavelength. From UV-DRS the optical band gap energy increases to 3-3.15 eV compare to the pure materials. The scanning Electron Microscopy(SEM) analysis conforms that the synthesized Mg:WO3 was spherical in shape and has 30-40 nm size in diameter. EDAX confirms the Mg doped in the synthesized material. The emission spectra of the undoped and Mg doped samples were analyzed using PL spectroscopy.