The　developments　of　the　living　alkene　polymerization　method　have　achieved　great　progress　and　enabled　the　precise　synthesis　of　important　polyalkenes　with　controlled　molecular　weight,　molecular　weight　distribution,　and　architecture　through　an　anionic,　cationic　or　radical　strategy.　However,　it　is　still　challenging　to　develop　a　living　alkene　polymerization　method　through　an　all-in-one　strategy　where　anionic　and　radical　characteristics　are　merged　into　one　polymerization　species.　Here,　a　versatile　living　polymerization　method　is　reported　by　introducing　a　well-established　all-in-one　covalent-anionic-radical　Barbier　strategy　into　a　living　polymerization.　Through　this　living　covalent-anionic-radical　Barbier　polymerization　(Barbier　CARP),　narrow　distributed　polystyrenes,　with　D　as　low　as　1.05,　are　successfully　prepared　under　mild　conditions　with　a　full　monomer　conversion　by　using　wide　varieties　of　organohalides,　for　example,　alkyl,　benzyl,　allyl,　and　phenyl　halides,　as　initiators　with　Mg　in　one　pot.　This　living　covalent-anionic-radical　polymerization　via　a　Barbier　strategy　expands　the　methodology　library　of　polymer　chemistry　and　enables　living　polymerization　with　an　unconventional　polymerization　mode.　©　2022　American　Chemical　Society.　All　rights　reserved.