In the recent years, many researchers have been worked on hydrogen storage in metal hydrides. Hydrogen storage in solid is new and safest way to store hydrogen in the forms of pressurized gas and cryogenic liquid. The magnesium (Mg) based hydride materials have been believed to one of the best capable hydrogen storage materials because of cost-effective and high hydrogen storage capability. The slow hydrogen absorption - desorption rate and high hydrogen absorption - desorption temperature bind these materials to use in the hydrogen storage applications. This review article overviews the current status of Mg-based metal hydrides thin films used for hydrogen storage. The Mg-based thin films metal hydrides like Mg-M (M-Ti, Ni, Mn, Co, Al) have been attracted much attention for hydrogen storage in last few years, because these materials have good storage of hydrogen having great reversible process, up to 7.6 wt%. Electrodes based on thin films inspire to see progress on magnesium based fuel cells. In addition, changes in electronic state of Mg-based materials reveals, after hydrogenation by means of metal-isolator transition, these materials may be used in many other applications viz. optical sensors, solar collectors, hydrogen sensors, smart windows, semiconductor electronics and solar cells.