Conductive　polymer　fabric　with　high-performance　electromagnetic　interference　shielding　effectiveness　(EMI　SE)　acts　as　a　shield　between　electromagnetic　waves　and　humans.　However,　it　is　challenging　to　decrease　the　reflection　loss　of　fabric　with　high　SE.　Nonmodified　and　nondestructive　carbon　nanotubes　incorporated　with　similar　to　3　nm　Fe3O4　nanoparticles　(MCNTs)　were　dispersed　in　a　sodium　alginate　solution　to　obtain　a　spinning　solution,　followed　by　wet　spinning　into　MCNT/alginate　composite　fiber.　The　fiber　is　flexible　and　can　be　twisted　and　woven　into　a　fabric　with　superior　stress　of　183　MPa,　excellent　EMI　SE　of　38.4　dB,　low　reflection　coefficient　of　0.165,　and　green　shielding　index　(g(s))　of　5.06,　which　exceed　the　reported　fabrics.　The　outstanding　green　EMI　shielding　performance　is　attributed　to　the　outstanding　electrical　conductivity　(221.9　S　m(-1))　and　moderate　magnetic　properties　(saturation　magnetization:　0.044　emu　g(-1)).　The　as-prepared　fabric　retained　89.7%　SE　after　being　exposed　to　air　for　8　months,　indicating　outstanding　durability.　Therefore,　the　fabric　has　great　potential　to　be　used　as　a　green　shielding　cloth　for　enhanced　protection.