To　explore　the　flexural　fatigue　performance　of　steel　fibers　reinforced　recycled　aggregate　concrete　(SF-RAC),　the　flexural　fatigue　test　and　residual　strength　test　with　different　stress　levels　were　conducted.　Besides,　the　fatigue　cracks　propagation　under　cyclic　loading　were　observed　and　analyzed　by　digital　image　correlation　(DIC)　technology.　The　results　show　that　the　flexural　fatigue　life　of　SF-RAC　increases　when　the　content　of　steel　fibers　increases,　and　it　is　proved　to　be　well　in　accordance　with　the　three-parameter　Weibull　distribution.　The　flexural　fatigue　life　equation　with　different　stress　level　and　reliability　(S-N-P　equation)　is　obtained　based　on　it,　which　shows　that　when　the　fiber　volume　content　is　1.5%,　the　fatigue　strength　of　SF-RAC　is　about　37.2%　higher　than　that　of　RAC　without　fibers.　Then,　a　fatigue　strain-based　damage　evolution　model　is　established,　and　the　derived　residual　strength　model　can　well　predict　the　damage　degree　and　residual　life　of　SF-RAC.　Moreover,　the　steel　fibers　can　improve　the　critical　crack　propagation　length　and　loading　cycles　of　RAC.　The　crack　propagation　rate　can　be　decreased　by　97.63%　when　the　fiber　volume　content　is　1.5%,　and　it　is　increased　with　the　development　of　stress　level.　Finally,　the　influence　mechanism　of　steel　fibers　on　flexural　fatigue　performance　of　RAC　were　explained　through　microstructure　tests.　©　2024　Elsevier　Ltd