The　anti-splitting　property　and　durability　are　important　indexes　for　developing　structural　crack　damage　and　the　bearing　capacity　of　structures.　Incorporating　fiber　can　significantly　improve　the　safety　performance　of　reinforced　concrete　(RC)　structures.　However,　the　enhancement　effect　of　different　fiber　content　on　the　properties　is　different　under　severe　corrosion　environments.　Therefore,　durability　tests　of　polypropylene　(PP)　fiber　concrete　with　different　volume　contents　are　carried　out　to　explore　the　best　fiber　volume　content　for　corrosion　resistance　in　this　study,　and　the　bonding　failure　mechanism　of　fiber-reinforced　concrete　(FRC)　was　studied.　The　test　indicated　that　the　high　PP　fiber　content　(1.5　%)　has　the　best　crack　inhibition　ability　in　severe　corrosion　environments　(15　%),　and　the　fiber　content　of　0.5　%　has　a　better　enhancement　effect　on　the　bond　strength,　bond　ductility,　and　bond　stiffness　of　polypropylene　fiber　reinforced　concrete　(PFRC)　specimens.　When　the　content　of　PP　fiber　was　0.5　%,　1.0　%,　and　1.5　%,　the　bond　strength　was　increased　by　3.99　%,　6.80　%　and　7.98　%,　respectively.　The　energy　dissipation　of　specimens　with　1.0　%　fiber　content　was　4.1　%　and　12.3　%　higher　than　that　of　specimens　with　0.5　%　and　1.5　%　fiber　content.　A　semi-empirical　formula　for　calculating　the　bond　strength　considering　the　fiber　content　and　corrosion　level　was　proposed　and　a　four-stage　bond-slip　constitutive　model　was　also　proposed.　Finally,　a　finite　element　model　considering　the　corrosion　distribution　and　the　bonding　properties　was　established,　and　the　simulated　values　are　in　good　agreement　with　the　experimental　values.　This　study　concluded　the　bonding　failure　mechanism　of　PFRC　structures　under　a　corrosion　environment　and　provides　theoretical　support　for　evaluating　the　bearing　capacity　and　bond　strength　of　corroded　PFRC　beams.