Adhesion　and　stretchable　hydrogel　electrolytes　have　emerged　as　an　ideal　candidate　in　the　fabrication　of　flexible　all-solid-state　supercapacitor.　However,　the　conventional　hydrogel　electrolyte　would　inevitably　deteriorate　or　even　deactivate　after　mechanical　damage　(stretching　and　cutting)　or　dehydrating.　As　an　alternative　to　overcome　these　limitations,　we　designed　a　dynamic　elastic　molecular　double　network　(DN)　hydrogel　electrolyte　consisting　of　poly(vinyl　alcohol)　(PVA)　and　poly(acrylic　amide-co-2-acrylamido-2-methylpropane　sulfonic　acid)　(P(AM-AMPS))　networks.　Glycerin　was　introduced　into　the　PVA/P(AM-AMPS)　system　to　enhance　the　inter-chain　physically-crosslinked　network.　This　DN　hydrogel　electrolyte　exhibited　remarkable　stretchability　(over　894%),　strong　adhesion　(37.00　kPa　to　carbon　materials)　and　high　ionic　conductivity　(3.85　S　m−1).　In　particular,　the　dynamic　physically-crosslinked　network　endowed　hydrogel　electrolyte　eminent　mechanical　tolerance.　The　toughness　of　hydrogel　kept　stable　in　10　times　500%　strain　loading–unloading　tensile　test.　Along　with　the　CNT　electrodes,　a　highly　flexible　all-solid-state　supercapacitor　was　prepared　by　using　our　developed　DN　hydrogel　as　electrolyte.　This　hydrogel-based　supercapacitor　exhibited　high　capacitance　(85.25　mF　cm−2　at　a　current　density　of　0.5　mA　cm−2).　More　importantly,　benefiting　from　the　unique　network　structure　of　hydrogel　electrolyte,　a　steady　bonding　interface　between　electrode　and　electrolyte　was　constructed.　Electrochemical　performance　of　supercapacitor　could　be　maintained　in　different　working　conditions.　The　capacitance　of　a　device　was　stable　upon　stretching　(200%　strain)　or　bending　(angle　of　0–180°).　In　addition,　hydrogel　based　supercapacitor　could　be　resumed　after　dehydrating　or　cutting　by　accident.　Our　results　provide　a　new　slight　into　multifunctional　all-solid-state　supercapacitor　preparation.　We　hope　this　hydrogel　will　promote　the　development　of　wearable　energy　storage.　©　2021　Elsevier　B.V.