Conductive　hydrogels　have　attracted　immense　interest　in　the　field　of　flexible　electronic　devices　and　biosensors.　However,　issues　such　as　poor　breathability,　insufficient　adhesion　and　water　retention　properties　still　remain　and　limit　their　applications　as　wearable　sensors.　To　address　these　issues,　a　porous　conductive　hydrogel　(SA/PAM/CTAB-GO)　with　high　breathability　(5.97　mg.cm−2·h−1),　favorable　conductivity　(2.85　S/m),　desirable　adhesion　(1.39　KPa)　and　moisture　retention　properties　was　synthesized　by　polymerization　and　crosslinking　using　sodium　alginate　and　polyacrylamide　as　gel　substrates,　cetyltrimethylammonium　bromide　modified　graphene　oxide　as　foam　stabilizer　and　Ca2+　as　crosslinking　agent.　The　hydrogel　exhibited　excellent　mechanical　properties,　water　retention　characteristics,　and　high　breathability　comparable　to　cotton.　Moreover,　the　SA/PAM/CTAB-GO　hydrogel　presented　excellent　sensing　sensitivity,　fast　response　ability　(225　ms),　and　favorable　endurance,　which　monitored　human　motions　sensitively　and　realized　the　accurate,　sensitive　and　reliable　detection　of　human　ECG　and　EMG　signals.　The　hydrogel　sensor　was　applied　in　human-computer　interaction　and　sensitively　controlled　robot　arms　and　virtual　characters.　The　design　of　dual　network　mechanism　of　calcium　crosslinking　and　foam　porosity　method　improved　the　sensing　properties,　breathability,　adhesion,　and　stability　of　the　hydrogel　making　it　possesses　high　performance　as　wearable　sensor　and　has　promising　application　prospect　in　flexible　electronics.　©　2025　Elsevier　B.V.