It　is　desirable　but　still　challenging　to　develop　mechanically　durable　and　flame-retardant　fabrics　with　multifunctional　sensing　capabilities.　Here,　we　propose　a　facile　layer-by-layer　assembly　and　coating　strategy　to　prepare　electrically　conductive　fabric　composites　(CFCs)　with　a　multiple　core-shell　structure　for　strain　and　temperature　sensing　and　fire　warning.　MXene　nanosheets　are　assembled　onto　the　cotton　fiber　surface　to　construct　the　electrically　conductive　network　and　wrapped　by　the　fire　retardant　and　hydrophobic　silicon　rubber.　The　interfacial　hydrogen　bonding　and　physical　adhesion　between　the　functional　layers　as　well　as　the　outmost　surface　hydrophobicity　protect　MXene　from　air　and　moisture　and　ensure　the　electrical　stability　and　durability　of　CFCs　during　mechanical　deformations.　The　multiple　shells　are　synergistically　transformed　to　protective　barriers　during　combustion,　endowing　the　composite　fabric　with　excellent　flame　retardancy.　When　suffering　from　a　flame　attack,　CFCs　show　a　very　short　response　time　of　less　than　1s　with　a　continuous　fire　warning　until　the　self-extinguishment　of　the　flame.　Benefiting　from　the　stretchability,　photothermal　conversion　and　thermoelectric　performance,　CFCs　can　also　be　used　for　strain　and　temperature　sensing.　This　work　provides　a　rational　structure　design　for　high　performance　and　multifunctional　fire　protection　and　warning.　©　2025　Elsevier　Ltd