The　demand　for　high-strength,　flexible,　and　multifunctional　electromagnetic　interference　(EMI)　shielding　materials　has　significantly　increased　in　many　fields.　Herein,　inspired　by　reinforced　concrete　pouring　in　construction,　we　propose　a　“consolidating”　method　to　successfully　fabricate　flame-retardant　thermoplastic　polyurethane　(TPU)　reinforced　bacterial　cellulose　(BC)/MXene/modified　silicon　carbide　nanowires　(MSiCnw)　aerogel　composites.　The　obtained　aerogel　composites　have　a　disordered　pore　structure,　in　which　BC/MXene/MSiCnw　is　used　as　the　internal　skeleton,　and　the　tightly　attached　flame　retardant　TPU　sheet　is　used　as　the　protective　layer.　The　as-synthesized　aerogel　composites　possess　excellent　mechanical　properties,　withstanding　repeated　compression　and　exhibiting　a　compressive　strength　of　8.86　kPa　which　is　735.8%　higher　than　that　of　BC　aerogel.　At　a　low　MXene　content　(6.17　wt%),　the　aerogel　composite　exhibits　an　EMI　utilization　efficiency　of　1209.08　dB/g　g−1　and　an　average　EMI　shielding　effectiveness　of　up　to　81.6　dB　(K-band).　Furthermore,　the　aerogel　composites　show　excellent　flame　retardant　property　(69.8%　reduction　in　peak　of　heat　release　rate).　More　interestingly,　the　aerogel　composite　displays　satisfactory　thermal　insulation　performances　and　reaches　a　low　thermal　conductivity　of　34.4　mW/m　K−1.　Overall,　the　as-prepared　highly　fire　safe　BC/MXene/MSiCnw/FRTPU　aerogel　composites　show　multifunctional　properties,　making　them　suitable　for　applications　in　electromagnetic　shielding　and　thermal　insulation.　©　2023　Elsevier　B.V.