The　magnesium　phosphate　cement　(MPC)-carbon　fiber　reinforced　plastics　(CFRP)　strengthening　and　electrochemical　chloride　extraction　(ECE)　integration　experiment　was　carried　out　for　reinforced　concrete　beams　corroded　by　sodium　chloride.　Then　the　bending　performance　of　the　reinforced　concrete　beams　was　analyzed　by　test　and　numerical　simulation.　The　reinforced　concrete　beams　of　the　control　group　were　energized　to　accelerate　corrosion　until　the　theoretical　corrosion　rate　of　the　steel　bars　reached　10%.　The　second　group　of　the　beams　were　strengthened,　and　the　other　three　groups　of　the　beams　were　strengthened　and　the　inside　chloride　was　removed　by　electrochemistry　method　with　different　dechlorination　current　densities.　The　bending　test　results　showed　that　the　bending　bearing　capacity　of　the　strengthened　concrete　beam　increased　by　18.22%.　The　bending　bearing　capacity　of　the　strengthened　and　dechlorinated　beam　increased　by　15.11%,　13.25%　and　9.76%,　respectively.　The　chloride　ion　content　at　the　interface　between　steel　bar　and　concrete　reduced　by　68.68%-82.64%.　In　addition,　the　numerical　simulation　method　of　＂standard　cube　test　block-central　pull　out　test　block-reinforced　concrete　beam＂　was　proposed.　A　3D　mesoscopic　finite　element　plastic　damage　model　of　the　reinforced　concrete　beams　strengthened　by　MPC-CFRP　was　established.　The　numerical　results　were　in　good　agreement　with　the　experimental　results.