Development　of　bio-based　hydrogels　with　good　mechanical　properties　and　high　electrical　conductivity　is　of　great　importance　for　their　excellent　biocompatibility　and　biodegradability.　Novel　electrically　conducive　and　tough　poly(vinyl　alcohol)/sodium　alginate　(PVA/SA)　composite　hydrogel　was　obtained　by　a　simple　method　in　this　paper.　PVA　and　SA　were　firstly　dissolved　in　distilled　water　to　form　the　composite　solution　and　the　pure　PVA/SA　hydrogel　was　obtained　through　the　freezing/thawing　process.　The　pure　PVA/SA　hydrogels　were　subsequently　immersed　into　the　saturated　NaCl　aqueous　solution　to　increase　the　gel　strength　and　conductivity.　The　effect　of　the　immersing　time　on　the　thermal　and　mechanical　properties　of　PVA/SA　hydrogel　was　studied.　The　swelling　properties　and　the　antiseptic　properties　of　the　obtained　PVA/SA　hydrogel　were　also　studied.　This　paper　provided　a　novel　way　for　the　preparation　of　tough　hydrogel　electrolyte.　©　2018