The　development　of　abundant,　cheap,　and　highly　active　catalysts　for　the　hydrogen　evolution　reaction　(HER)　and　oxygen　evolution　reaction　(OER)　is　important　for　hydrogen　production.　Nanolaminate　ternary　transition　metal　carbides　(MAX　phases)　and　their　derived　two-dimensional　transition　metal　carbides　(MXenes)　have　attracted　considerable　interest　for　electrocatalyst　applications.　Herein,　four　new　MAX@MXene　core-shell　structures　(Ta2CoC@　Ta2CTx,　Ta2NiC@Ta2CTx,　Nb2CoC@Nb2CTx,　and　Nb2NiC@Nb2CTx),　in　which　the　core　region　is　Co/Ni-MAX　phases　while　the　edge　region　is　MXenes,　have　been　prepared.　Under　alkaline　electrolyte　conditions,　the　Ta2CoC@Ta2CTx　core-shell　structure　showed　an　overpotential　of　239　mV　and　excellent　stability　during　the　HER　with　MXenes　as　the　active　sites.　For　the　OER,　the　Ta2CoC@Ta2CTx　core-　shell　structure　showed　an　overpotential　of　373　mV　and　a　small　Tafel　plot　(56　mV　dec-1),　which　maintained　a　bulk　crystalline　structure　and　generated　Co-based　oxyhydroxides　that　formed　by　surface　reconstruction　as　active　sites.　Considering　rich　chemical　compositions　and　structures　of　MAX　phases,　this　work　provides　a　new　strategy　for　designing　multifunctional　electrocatalysts　and　also　paves　the　way　for　further　development　of　MAX　phase-based　materials　for　clean　energy　applications.