MXene　aerogels　have　shown　great　potential　for　many　important　functional　applications,　in　particular　electromagnetic　interference　(EMI)　shielding.　However,　it　has　been　a　grand　challenge　to　create　mechanically　hyperelastic,　air-stable,　and　durable　MXene　aerogels　for　enabling　effective　EMI　protection　at　low　concentrations　due　to　the　difficulties　in　achieving　tailorable　porous　structures,　excellent　mechanical　elasticity,　and　desired　antioxidation　capabilities　of　MXene　in　air.　Here,　a　facile　strategy　for　fabricating　MXene　composite　aerogels　by　co-assembling　MXene　and　cellulose　nanofibers　during　freeze-drying　followed　by　surface　encapsulation　with　fire-retardant　thermoplastic　polyurethane　(TPU)　is　reported.　Because　of　the　maximum　utilization　of　pore　structures　of　MXene,　and　conductive　loss　enhanced　by　multiple　internal　reflections,　as-prepared　aerogel　with　3.14 wt%　of　MXene　exhibits　an　exceptionally　high　EMI　shielding　effectiveness　of　93.5 dB,　and　an　ultra-high　MXene　utilization　efficiency　of　2977.71 dB g g−1,　tripling　the　values　in　previous　works.　Owing　to　the　presence　of　multiple　hydrogen　bonding　and　the　TPU　elastomer,　the　aerogel　exhibits　a　hyperelastic　feature　with　additional　strength,　excellent　stability,　superior　durability,　and　high　fire　safety.　This　study　provides　a　facile　strategy　for　creating　multifunctional　aerogels　with　great　potential　for　applications　in　EMI　protection,　wearable　devices,　thermal　management,　pressure　sensing,　and　intelligent　fire　monitoring.　©　2023　The　Authors.　Advanced　Functional　Materials　published　by　Wiley-VCH　GmbH.