An　intelligent　fiber　actuator　that　can　sense,　adapt,　and　interact　with　environmental　stimuli　is　highly　desirable　for　numerous　applications.　However,　conventional　fiber　sensors　have　difficulty　in　responding　to　complex　environments　with　fast　sensing　and　actuation.　Herein,　water/light　dual-responsive　double-twisted　RGO@HHF　(hollow　hydrogel　fiber　loaded　with　reduced　graphene　oxide)　actuators　are　successfully　developed　based　on　dynamic　self-contraction/elongation　via　twisting,　folding,　plying,　and　re-plying　process.　Under　stimuli　by　water　and　light,　the　twisted　RGO@HHF　provides　a　forward　and　reverse　torsional　stroke　of　3168　and　60　degrees　cm(-1),　respectively.　The　excellent　swelling　properties　endow　the　fiber　with　highly　effective　water-responsive　ability,　and　the　hollow　structure　can　reduce　the　water　required　for　fiber　to　swell.　Meanwhile,　the　RGO　loading　further　accelerates　water　evaporation　and　enhances　the　light　response　rate　of　the　fiber.　After　twisting　and　re-plying,　the　double-twisted　RGO@HHF　exhibits　highly　increased　elongation　and　contraction　under　light/water　stimulation.　On　this　basis,　a　new　strategy　is　proposed　for　efficient　desalination　and　anti-salt　accumulation.　The　double-twisted　RGO@HHF　can　elongate　to　absorb　water　and　contract　to　evaporate　seawater　under　sunlight/water　stimulation,　respectively.　The　accumulated　salt　can　be　dissolved　in　the　seawater　during　the　dynamic　process.　This　study　provides　a　promising　approach　for　realizing　sustainable　seawater　desalination.