Shear　properties　of　the　rock-concrete　interface　are　critical　to　the　stability　of　deep　underground　engineering　projects,　particularly　in　high-temperature　environments　caused　by　geothermal　activity,　fire　or　nuclear　waste　radiation.　A　series　of　cyclic　shear　tests　were　performed　on　the　pre-heated　sandstone-concrete　interface　under　both　CNL　and　CNS　conditions.　The　study　carefully　examined　the　degradation　characteristics　of　shear　mechanics,　as　well　as　the　evolution　of　interfacial　damage　and　energy,　during　cyclic　shear　of　rock-concrete　interface.　The　experimental　results　show　that　the　pre-heating　temperature　and　the　number　of　shear　cycles　have　considerable　effects　on　the　adhesion,　shear　strength,　normal　deformation,　shear　stiffness　and　friction　coefficient　of　the　sandstone-concrete　interface,　especially　under　CNS　conditions.　Furthermore,　the　nonlinear　evolution　of　interfacial　damage　and　energy　release　during　cyclic　shear　is　highly　dependent　on　the　pre-heating　temperature.　These　test　results　provide　valuable　insights　for　revealing　the　mechanical　degradation　and　evaluating　the　shear　performance　of　rock-concrete　interfaces　in　deep　underground　engineering　projects　subjected　to　high-temperature　environments.