The present invention relates to a method for preparing hydrogen gas, which is characterized by that the aqueous solution or alkaline aqueous solution of metal boron hydride is contacted with transition metal boride catalyst deposited on the porous carrier material by means of chemical deposition method to make boron hydride produce hydrolysis reaction and release out hydrogen gas. Said inventionalso provides the equipment for implement said method, said equipment includes reaction liquor container, catalytic reaction tube communicated with reaction liquor container and gas storage tube communicated with catalyst reaction tube, and the catalytic reaction tube interior is filled with the transition metal boride catalyst deposited on porous carrier material by means of chemical deposition method.