Transparent　conducive　hydrogels　with　intrinsic　flexibility,　high　sensitivity　and　outstanding　repeatability　and　nearly　real-time　response　are　highly　demanded　for　wearable　devices/sensors.　Here　we　report　a　novel　ionic　conductor　hydrogel　consisting　of　interpenetrating　sodium　carboxymethylcellulose　(CMC)　microsheets　and　polyacrylamide　(PAAm)　network.　Intrinsic　interactions　between　the　CMC　and　PAAm　endow　the　hydrogel　with　outstanding　physical,　mechanical　robustness.　The　ionic　hydrogel　shows　a　very　high　transparency　(98.2%),　high　adhesion　efficiency　(64%　in　strength),　outstanding　repeatability　(500　cycles　at　the　strain　of　300%),　sensitivity　(Gauge　factor　=　3.15),　and　nearly　real-time　response　(360　ms)　to　a　small　amount　of　stress.　Additionally,　two　pieces　of　the　semi-interpenetrating　hydrogel　can　be　bonded　together　with　CMC　membrane　instantly　without　any　external　stimulation.　Strain　sensor　based　on　the　semi-interpenetrating　network　hydrogel　has　been　demonstrated　reliable　in　detecting　a　small　strain　caused　by　a　subtle　vibration　up　to　a　very　large　deformation　by　stretching.　The　hydrogel-based　strain　sensor　may　be　applied　in　human　motion　detection,　smart　cushion　and　soft　robotics.