Solar-driven　steam　generation　(SDSG)　offers　a　sustainable　route　for　clean　water　production,　yet　its　efficiency　is　often　hindered　by　intermittent　solar　availability　and　salt　accumulation.　Here,　we　present　a　flexible　all-day　evaporator　based　on　sodium　alginate　(SA).　This　system　combines　ion-crosslinked　SA/MXene　hydrogels　with　conductive　nanofiber　composites,　establishing　dual-pathway　thermal　activation　mechanism　involving　photo-thermal　conversion　and　Joule　heating,　thereby　achieving　efficient　energy　utilization.　This　design　achieves　high　electrical　conductivity　and　photothermal　efficiency,　enabling　a　peak　evaporation　rate　of　6.45　f　0.06　kg　&　sdot;m-2　h-1under　1　sun　with　a　2　V　bias　and　sustained　nocturnal　water　production　of　1.24　f　0.12　kg　&　sdot;m-2　&　sdot;h-1　via　low-voltage　electrothermal　heating.　The　design　features　self-adaptive　salt　diffusion　channels,　ensuring　stable　performance　over　10-hour　cycles　in　3.5　wt%　saline　water　without　salt　accumulation.　This　multifunctional　system　effectively　overcomes　the　limitations　of　traditional　SDSG　technologies,　including　weather-dependent　operation　and　salt　crystallization,　by　decoupling　light　absorption,　heat　localization,　and　salt　management.　This　work　provides　a　robust　and　innovative　strategy　for　scalable,　continuous　desalination,　addressing　key　limitations　in　current　SDSG　systems.