Abstract: The present disclosure provides a hydrogen evolution electrode and a preparation method thereof. The preparation method includes the following steps: providing an electrolyte including Co(NO3)2·6H2O with a Co(NO3)2 concentration of 0.005 mol L?1 to 0.015 mol L?1, MnCl2·4H2O with a MnCl2 concentration of 0.005 mol L?1 to 0.01 mol L?1, KCl with a concentration of 0.003 mol L?1 to 0.008 mol L?1, and CH3CSNH2 with a concentration of 0.04 mol L?1 to 0.06 mol L?1; adjusting the electrolyte to a pH value of 6 to 7; providing a cathode in the form of a substrate; and conducting electrolysis in a cyclic voltammetry mode, thereby preparing the electrode for hydrogen production by water electrolysis through electrochemical deposition of a Co9-xMnxS8 nanosheet catalyst on the cathode substrate, where 1?X?7.