In　this　paper,　ABAQUS　software　is　used　to　carry　out　finite　element　simulation　on　the　axial　compression　performance　of　corroded　round　steel　pipe　members　reinforced　by　FRP　casing　grouting.　Moreover,　its　working　mechanism　and　failure　mode　are　analyzed.　A　typical　load-displacement　curve　of　the　component　is　obtained.　Furthermore,　the　effect　of　FRP　pipe　thickness,　grouting　thickness,　corrosion　rate,　concrete　strength,　and　slenderness　ratio　on　the　mechanical　performance　of　the　component　is　explored.　The　research　results　indicate　that　the　component　load-displacement　curve　can　be　characterized　by　bilinear　and　trilinear　models.　The　former　corresponds　to　the　overall　buckling　failure　mode,　while　the　latter　corresponds　to　the　strength　failure　mode　for　the　bare　ends　of　a　round　steel　tube.　After　reinforcement,　the　component　bearing　capacity　increases　up　to　166.83%.　Moreover,　the　increase　is　positively　correlated　with　FRP　pipe　thickness,　grouting　thickness,　and　corrosion　rate.　The　component　bearing　capacity　first　decreases　and　then　increases　when　modifying　the　slenderness　ratio,　while　concrete　strength　has　a　minor　effect　on　it.　Moreover,　the　bending　stiffness　ratio　equation　and　the　stability　bearing　capacity　correction　equation　of　the　axial　compression　reinforced　components　are　proposed.　The　aforementioned　provides　reference　suggestions　for　practical　engineering　applications　of　corroded　steel　structures　reinforced　by　FRP　casing　grouting.　©　2022　Elsevier　Ltd