Aerogel　sensors　have　drawn　considerable　interest　in　the　recent　research　world.　However,　simultaneously　maintaining　superelasticity　and　an　outstanding　piezoresistive　effect　under　changing　environmental　conditions　remains　challenging.　Here,　sodium　alginate　(SA)　was　used　as　a　bonding　agent　for　MXene　nanosheets　and　polydimethylsiloxane　(PDMS)　as　a　reinforcing　agent　to　prepare　SA/MXene/PDMS　(SMP)　composite　aerogel　with　excellent　high　conductivity,　mechanical　elasticity,　reliable　thermal　insulation,　and　good　hydrophobicity.　The　interaction　between　MXene　nanosheets　and　SA　enhances　the　3D　network　framework　of　the　aerogel.　The　aerogel　with　a　layer-support　network　structure　prepared　by　the　modified　directional　freezing　method　showed　light　weight,　high　sensitivity　(37.43　kPa−1),　significant　reversible　compression　(70%)　and　excellent　fatigue　resistance　(60,000　cycles).　The　piezoresistive　sensor　based　on　SMP　composite　aerogel　can　quickly　respond　to　pressure/strain　signals,　which　can　be　further　used　for　pulse　beating,　sound　detection,　motion　monitoring,　foot　posture　diagnosis　and　human　health　monitoring.　Additionally,　the　MXene　aerogel　sensor　based　on　carbon　material　with　frequency　response　characteristics　can　detect　low　to　high　frequency　vibration　signals,　has　frequency　response　characteristics　that　can　detect　low　to　high-frequency　vibration　signals,　making　it　useful　for　rotating　machinery　speed　detection,　cantilever　beam　vibration　detection,　non-destructive　testing　of　cantilever　beams,　and　other　engineering　applications.　With　its　the　layered　porous　structure　and　the　assistance　of　PDMS,　the　aerogel　also　exhibits　larger　water　contact　angles　(119°)　and　extreme　environmental　suitability　(−40　to　80　°C),　performing　a　wide　range　of　application　potential　in　many　fields.　©　2023