In　order　to　overcome　the　defects　of　the　layered　double　hydroxide　(LDH)　with　poor　electrical　conductivity　and　the　limited　active　sites,　in　this　paper,　an　advanced　three-dimensional　(3D)　NiFe-LDH/rGO@NF　composite　material　was　designed　and　prepared　by　reducing　graphene　oxide　(rGO)　flakes　on　nickel　foam　(NF)　and　growing　NiFe-LDH　nanosheets　in-situ.　Excitingly,　the　3D　NiFe-LDH/rGO@NF　composites　exhibited　excellent　electrocatalytic　performance.　By　analyzing　the　microstructure　and　electrochemical　properties　of　NiFe-LDH/rGO@NF,　the　synergistic　effect　of　3D-NF　and　2D-rGO　on　oxygen　evolution　reaction　(OER)　and　electrocatalysis　performance　in　3D　NiFe-LDH/rGO@NF　was　explored.　The　results　show　that　the　composite　structure　composed　of　2D　rGO　and　3D　NF　is　synergistic　with　each　other.　On　the　one　hand,　this　composite　structure　can　very　effectively　increase　the　specific　surface　area　to　inhibit　agglomeration　and　expose　abundant　active　sites　of　LDH.　On　the　other　hand,　both　rGO　and　NF　can　enhance　the　electrical　conductivity　of　NiFe-LDH　and　improve　the　transportability　of　electrons　and　ions　due　to　the　excellent　electrical　conductivity.　Additionally,　the　3D　NiFe-LDH/rGO@NF　exhibits　excellent　OER　catalytic　performance,　with　an　overpotential　of　277　mV　at　50　mA/cm2　and　a　Tafel　slope　of　59.9　mV/dec.　©　2021