The　facile　preparation　of　hydrogel　electrolyte　with　high　strength,　healing　ability　and　thermoplasticity　is　important　and　still　remains　a　great　challenge.　In　this　paper,　a　novel　way　for　the　preparation　of　poly(vinyl　alcohol)　(PVA)　supramolecular　hydrogel　electrolyte　was　presented.　The　PVA　hydrogel　electrolyte　was　prepared　via　the　hydrogen　bonding　and　salting-out　effect.　The　high　performance　PVA-NaCl-glycerol　hydrogel　electrolyte　could　be　obtained　by　the　doping　of　glycerol　and　NaCl　into　PVA　aqueous　solution　and　storing　at　room　temperature　for　2.0　h.　The　crystallinity,　thermal　and　mechanical　properties　of　PVA-NaCl-glycerol　hydrogel　electrolyte　were　characterized　by　Fourier　transformed　infrared　spectroscopy,　X-ray　diffraction　measurement　and　tensile　testing,　respectively.　The　hydrogel　forming　mechanism　was　discussed.　The　PVA-NaCl-glycerol　hydrogels　performed　the　high　toughness　with　the　tensile　strength　and　elongation　at　break　of　0.57　(±0.02)　MPa　and　575　(±29)%,　respectively.　The　conductivity　of　PVA-NaCl-glycerol　was　as　high　as　92.5　(±0.18)　mS/cm.　The　PVA-NaCl-glycerol　hydrogel　electrolyte　behaved　the　excellent　heat　healing　ability　and　thermoplasticity.　These　properties　of　PVA-NaCl-glycerol　are　related　to　the　role　of　glycerol　and　NaCl.　This　paper　provides　a　new　preparation　method　and　structure　design　idea　for　the　high　performance　hydrogel　electrolyte.　©　2018　Elsevier　Ltd