It　is　a　considerable　challenge　to　develop　a　composite　material　with　ultra-light　and　high　electromagnetic　interference　(EMI)　shielding　efficiency　for　the　next　generation　of　electronic　equipment.　MXenes　have　received　extensive　attention　in　composite　aerogel　EMI　shielding　due　to　their　abundant　surface　groups　and　ultra-high　conductivity.　However,　the　poor　mechanical　properties　make　them　difficult　to　apply　on　a　large　scale.　Here,　we　demonstrate　a　simple　method　to　construct　ultra-light　conductive　Ti3C2Tx　MXene/aramid　nanofibers　(ANFs)/carbon　nanotubes　(CNTs)　aerogels　with　a　“sandwich”　structure.　CNTs　and　MXene　absorb　and　reflect　electromagnetic　waves,　while　ANF　aerogel　provides　good　mechanical　strength.　Our　composite　aerogels　with　an　extra-high　EMI　shielding　efficiency　of　up　to　69.0　dB　at　the　X-band,　despite　their　thickness　and　density　being　only　2　mm　and　0.0428　g/cm3,　respectively.　At　the　same　time,　the　composite　aerogel　with　a　low　0.0488　W/(m·K)　thermal　conductivity　shows　extraordinary　flame　resistance,　heat　preservation,　and　insulation　ability.　Besides,　MXene/ANFs/CNTs　aerogel　can　reach　104　°C　in　3　s　under　an　8　V　voltage　and　shows　long-term　Joule　heating　stability.　This　work　provides　a　forward-looking　idea　for　building　multifunctional　EMI　shielding　materials.　The　obtained　aerogels　have　potential　applications　in　aerospace,　portable　electronic　devices,　and　defense　industries.　©　2023　American　Chemical　Society