Although　conductive　hydrogels　have　emerged　as　promising　materials　for　developing　highly　flexible　sensors　in　recent　years,　traditional　hydrogels　are　prone　to　swelling,　which　significantly　compromises　sensor　performance.　To　address　this　issue,　a　non-swelling　hydrogel　is　prepared　through　a　one-step　radical　polymerization　of　acrylic　acid　(AA),　hydroxyethyl　methacrylate　(HEMA),　tannic　acid　(TA),　and　quaternized　chitosan　(QCS)　in　aqueous　water.　The　resultant　poly(AA-HEMA)-QCS-TA　(PAHCT)　hydrogel　features　a　highly　crosslinked　network,　attributed　to　the　formation　of　multiple　hydrogen　bonds　among　the　abundant　hydroxyl　and　carboxyl　groups　in　AA,　TA,　and　QCS,　the　electrostatic　interactions　between　poly(AA-HEMA)　and　QCS,　as　well　as　polymer　chain　entanglements.　This　innovative　architecture　significantly　enhances　the　anti-swelling　ability　of　the　PAHCT　conductive　hydrogel,　achieving　an　equilibrium　swelling　ratio　of　5.5%　in　water,　along　with　remarkable　tensile　properties,　reaching　an　elongation　of　990%.　Furthermore,　the　introduction　of　TA　further　improves　the　hydrogel＇s　adhesion,　ensuring　its　durability　for　long-term　service.　Consequently,　strain　sensors　based　on　the　non-swelling　PAHCT　hydrogel　are　capable　of　effectively　monitoring　human　activities　across　various　strain　range　and　enabling　reliable　underwater　communication.　These　findings　open　new　avenues　for　the　development　of　wearable　sensors　in　amphibious　environments,　broadening　the　application　scope　of　wearable　electronics.