Hydrogel-based　conductive　materials　for　smart　wearable　devices　have　attracted　increasing　attention　due　to　their　excellent　flexibility,　versatility,　and　outstanding　biocompatibility.　This　review　presents　the　recent　advances　in　multifunctional　conductive　hydrogels　for　electronic　devices.　First,　conductive　hydrogels　with　different　components　are　discussed,　including　pure　single　network　hydrogels　based　on　conductive　polymers,　single　network　hydrogels　with　additional　conductive　additives　(i.e.,　nanoparticles,　nanowires,　and　nanosheets),　double　network　hydrogels　based　on　conductive　polymers,　and　double　network　hydrogels　with　additional　conductive　additives.　Second,　conductive　hydrogels　with　a　variety　of　functionalities,　including　self-healing,　super　toughness,　self-growing,　adhesive,　anti-swelling,　antibacterial,　structural　color,　hydrophobic,　anti-freezing,　shape　memory　and　external　stimulus　responsiveness　are　introduced　in　detail.　Third,　the　applications　of　hydrogels　in　flexible　devices　are　illustrated　(i.e.,　strain　sensors,　supercapacitors,　touch　panels,　triboelectric　nanogenerator,　bioelectronic　devices,　and　robot).　Next,　the　current　challenges　facing　hydrogels　are　summarized.　Finally,　an　imaginative　but　reasonable　outlook　is　given,　which　aims　to　drive　further　development　in　the　future.