It　is　very　essential　to　grow　efficient　and　abundant　photocatalysts　for　overall　water　cracking　to　produce　hydrogen.　Ni3FeN　nanosheets　were　synthesized　by　combining　simple　sol–gel　and　calcining　methods　using　urea　as　nitrogen　source.　A　heterostructure　was　constructed　between　Ni3FeN　and　g-C3N4　to　enhance　the　absorption　capacity　of　visible　light.　The　reformed　Z-scheme　Ni3FeN/g-C3N4　heterojunction　exhibited　an　excellent　visible-light　photocatalytic　activity.　The　average　hydrogen　evolution　rate　of　5 wt%　Ni3FeN/g-C3N4　composite　is　528.7 μmol h−1 g−1　due　to　the　Z-scheme　Ni3FeN/g-C3N4　junction,　which　promotes　the　separation　of　photogenerated　e−/h+.　Interestingly,　the　average　H2　production　of　Ni3FeN/g-C3N4　is　nearly　8.3　and　3.6　times　higher　than　that　of　Fe4N/g-C3N4　and　Ni4N/g-C3N4,　respectively,　indicating　that　bimetallic　nitrides　as　cocatalysts　are　more　conducive　to　enhancing　the　performance　of　photocatalysts.　Importantly,　the　Ni3FeN/g-C3N4　composite　exhibited　good　cycle　stability,　and　the　hydrogen　production　performance　hardly　changed　after　four　cycle　experiments.　Furthermore,　photoluminescence,　electrochemical　impedance　spectroscopy,　and　transient　photocurrent　response　show　that　Ni3FeN/g-C3N4　heterojunction　improves　the　separation　efficiency　of　photoinduced　e−/h+.　This　work　provides　a　feasibility　of　the　cocatalyst　Ni3FeN　for　use　in　photocatalytic　hydrogen　production.　©　2023　The　American　Ceramic　Society.