The invention relates to a hydrogen evolution electrode, a preparation method and applications thereof. The preparation method specifically comprises: washing a foam metal foam nickel as a substrate,and electrochemically depositing a layer of a granular alloy containing one or more than two selected from nickel, cobalt and molybdenum on the surface; carrying out room temperature aging in a solution containing chlorine ions to from a layer of a nano-sheet-like hydroxide with a nano-scale thickness on the surface of the electroplating layer, wherein the hydroxide is corresponding to the electrodeposition metal; and electrochemically depositing trace platinum, and continuously carrying out room temperature aging to increase the thickness of the hydroxide so as to obtain the hydrogen evolution electrode with the multi-level pore channel structure. According to the present invention, the prepared hydrogen evolution cathode has the low platinum loading, has the excellent hydrogen evolutionmass specific activity at the platinum loading of lower than 10 [mu]g/cm<2>, and has good stability in the application of magnesium-water batteries.