Flexible　strain　sensors　have　made　great　progress　and　been　applied　tentatively　in　recent　years.　However,　there　are　still　many　challenges　and　problems　hindering　their　widespread　application,　including　incompatible　high　sensitivity　and　wide　detection　range,　poor　durability,　and　time-consuming　fabrication　procedures.　In　this　work,　a　dual-nozzle-assisted　one-step　strategy　for　the　fabrication　of　integrated　flexible　strain　sensors　is　proposed.　During　the　fabrication,　Ecoflex　and　its　composite　multiwalled　carbon　nanotube　(MWCNT)/Ecoflex　were　extruded　and　thermally　cured　from　the　two　nozzles,　respectively.　Taking　advantage　of　the　same　base　resin,　the　strain-sensitive　and　the　insulating　components　in　the　fabricated　flexible　strain　sensors　are　chemically　bonded　firmly　and　form　an　integrated　device.　The　fabricated　sensor　exhibits　good　performance　in　terms　of　high　gauge　factor　(GF　=　165.3),　good　stability,　low　hysteresis,　fast　response　time　(60　ms),　wide　detection　range　(0%-300%　strain),　and　ultralow　detection　limit　(0.1%　strain),　showing　promising　applications　in　health　monitoring　and　human-computer　interaction.