Wearable　strain　sensors　have　aroused　increasing　interest　in　human　motion　monitoring,　even　for　the　detection　of　small　physiological　signals　such　as　joint　movement　and　pulse.　Stable　monitoring　of　underwater　human　motion　for　a　long　time　is　still　a　notable　challenge,　as　electronic　devices　can　lose　their　effectiveness　in　a　wet　environment.　In　this　study,　a　superhydrophobic　and　conductive　knitted　polyester　fabric-based　strain　sensor　was　fabricated　via　dip　coating　of　graphene　oxide　and　polydimethylsiloxane　micro/nanoparticles.　The　water　contact　angle　of　the　obtained　sample　was　156°,　which　was　retained　above　150°　under　deformation　(stretched　to　twice　the　original　length　or　bent　to　80°).　Additionally,　the　sample　exhibited　satisfactory　mechanical　stability　in　terms　of　superhydrophobicity　and　conductivity　after　300　abrasion　cycles　and　20　accelerated　washing　cycles.　In　terms　of　sensing　performance,　the　strain　sensor　showed　a　rapid　and　obvious　response　to　different　deformations　such　as　water　vibration,　underwater　finger　bending,　and　droplet　shock.　With　the　good　combination　of　superhydrophobicity　and　conductivity,　as　well　as　the　wearability　and　stretchability　of　the　knitted　polyester　fabric,　this　wireless　strain　sensor　connected　with　Bluetooth　can　allow　for　the　remote　monitoring　of　water　sports,　e.g.,　swimming,　and　can　raise　an　alert　under　drowning　conditions.　©　2022　American　Chemical　Society.