Strong　and　tough　ionic　conductive　hydrogel　is　one　of　the　key　raw　materials　for　the　development　of　high-performance　flexible　electronic　products.　However,　it　is　still　challenging　to　prepare　ionic　conductive　hydrogel　materials　with　the　integration　of　ultra-high　mechanical　strength,　extremely　high　toughness　and　ionic　conduc-tivity.　In　this　work,　a　simple　strategy　is　proposed　to　prepare　super　strong　and　tough　hydrogels　through　multi　-length　scale　synergistic　strengthening.　The　directional　freeze-casting　would　endow　hydrogels　with　good　aniso-tropic　structure　at　the　micro-scale　and　the　post-treatment　of　soaking　in　the　saturated　Na3Cit　and　Al2(SO4)3　composite　solution　would　introduce　metal　complexation　and　chain　entanglement　to　realize　network　structure　densification　at　the　sub-micro　and　nano-scale.　These　effects　have　been　proven　to　be　positive　and　synergistic,　which　can　significantly　increase　the　tensile　strength,　toughness　and　Young＇s　modulus　of　the　poly(vinyl　alcohol)/　carboxymethyl　chitosan　(PVA/CMCS)　hydrogel.　The　optimum　tensile　strength,　toughness,　Young＇s　modulus　and　tear　energy　of　PVA/CMCS/Na3Cit/Al2(SO4)3　hydrogel　reach　25.9　MPa,　90.9　MJ/m3,　422.6　MPa　and　118.2　MJ/　m2.　This　super　strong　and　tough　conductive　hydrogel　was　assembled　into　a　sensor　and　combined　with　Morse　code　to　realize　information　transmission,　encryption　and　decryption.　This　work　provides　a　new　scheme　for　the　preparation　of　ultra-strong　ionic　conductive　hydrogel　for　flexible　electronics.