Facile　preparation　of　super　tough　hydrogels　with　low　temperature　tolerance　and　anti-swelling　property　is　still　a　challenging　task　for　researchers.　Meanwhile,　the　vast　majority　of　tough　hydrogels　were　obtained　though　chemical　crosslinking　and　complicated　synthesis　or　processing　method　accompanying　a　large　number　of　harmful　chemical　reagents.　Herein,　the　super　tough　chitosan/poly(vinyl　alcohol)　(CS/PVA)　hydrogels　(the　maximum　compressive　strength　of　18.97　MPa　at　a　strain　of　80%　and　the　maximum　tensile　strength　of　4.02　MPa　at　a　strain　of　406.4%)　were　successfully　prepared　via　a　simple　post-treatment　method.　CS/PVA　hydrogels　were　firstly　prepared　by　freezing-thawing　process　and　then　soaking　in　saturated　sodium　chloride　aqueous　solution.　The　resultant　hydrogels　possess　excellent　swelling　resistance　and　low　temperature　tolerance.　This　work　shows　that　the　post-treatment　of　immersing　in　saline　solution　is　a　feasible　way　to　prepare　super　tough　hydrogels　with　low　temperature　tolerance　and　anti-swelling　property.　This　also　would　enlarge　the　application　areas　of　CS.　©　2019　Elsevier　B.V.