The　catalyst　employed　in　industries　for　the　hydrogen　evolution　reaction　in　seawater　electrolyte　suffers　from　scarcity,　unsatisfactory　catalytic　activity　and　stability　at　large　current　density.　To　produce　hydrogen　under　large　current　densities,　the　electrode　requires　both　robust　mechanical　stability　and　high　intrinsic　catalytic　activity.　It　remains　challenging　to　create　an　electrode　that　ensures　the　exposure　of　catalytic　sites　while　strengthening　the　binding　force　between　the　substrate　and　the　catalyst,　particularly　in　natural　alkaline　seawater　electrolytes.　In　this　work,　the　multi-heterostructure　H2-NiCo2O4@NiMoO4　electrocatalyst　with　multi-interface　was　developed　through　a　facile　hydrothermal　strategy,　followed　by　a　thermal　reduction　strategy.　In　1　M　KOH　aqueous　solution,　the　H2-NiCo2O4@NiMoO4　exhibited　an　overpotential　of　216　mV　at　1000　mA　cm-2　and　a　low　Tafel　slope　of　29　mV　dec-1.　Furthermore,　a　low　Tafel　slope　of　31　mV　dec-1　and　a　current　density　of　1000　mA　cm-2　could　be　achieved　with　only　249　mV　in　seawater　electrolytes　(pH　=　14).　Remarkably,　the　H2-NiCo2O4@NiMoO4　electrocatalyst　required　only　445　and　345　mV　to　reach　an　ultra-high　current　density　of　4000　mA　cm-2　in　1　M　KOH　and　alkaline　natural　seawater　electrolyte,　respectively.　Additionally,　the　H2-NiCo2O4@NiMoO4　electrocatalyst　demonstrated　excellent　long-term　stability　of　over　12　h　in　both　1　M　KOH　and　alkaline　seawater　electrolyte.　This　work　may　pave　a　novel　avenue　for　the　development　of　excellent　non-noble　metal　catalysts　for　hydrogen　evolution　reactions　in　industrial　applications.