Ceramic　aerogels　are　attractive　candidates　for　high-temperature　thermal　insulation,　catalysis　support,　and　ultrafiltration　materials,　but　their　practical　applications　are　usually　limited　by　brittleness.　Recently,　reversible　compressibility　has　been　realized　in　flexible　nanostructures-based　ceramic　aerogels.　However,　these　modified　aerogels　still　show　fast　and　brittle　fracture　under　tension.　Herein,　we　demonstrate　achieving　reversible　stretch　and　crack　insensitivity　in　a　highly　compressible　ceramic　aerogel　through　engineering　its　microstructure　by　using　curly　SiC-SiOx　bicrystal　nanowire　as　the　building　blocks.　The　aerogel　exhibits　large-strain　reversible　stretch　(20%)　and　good　resistance　to　high-speed　tensile　fatigue　test.　Even　for　a　prenotched　sample,　a　reversible　stretch　at　10%　strain　is　achieved,　indicating　good　crack　resistance.　The　aerogel　also　displays　reversible　compressibility　up　to　80%　strain,　ultralow　thermal　conductivity　of　28.4　mW　m-1　K-1,　and　excellent　thermal　stability　even　at　temperatures　as　high　as　1200　°C　in　butane　blow　torch　or　as　low　as　-196　°C　in　liquid　nitrogen.　Our　findings　show　that　the　attractive　tensile　properties　arise　from　the　deformation,　interaction,　and　reorientation　of　the　curly　nanowires　which　could　reduce　stress　concentration　and　suppress　crack　initiation　and　growth　during　tension.　This　study　not　only　expands　the　applicability　of　ceramic　aerogels　to　conditions　involving　complex　dynamic　stress　under　extreme　temperature　conditions　but　also　benefits　the　design　of　other　highly　stretchable　and　crack-resistant　porous　ceramic　materials　for　various　applications.