Harnessing　renewable　solar　resources　to　drive　water　electrolyzer　to　attain　hydrogen　fuel　is　of　paramount　significance　to　a　sustainable　energy　future.　Nevertheless,　the　intermittent　and　instable　drawbacks　of　sunlight　greatly　limit　their　practical　applications.　In　this　sense,　incorporating　an　energy　storage　module　in　between　the　photovoltaic　and　electrolytic　cells　separately　is　an　effective　solution　to　cushion　this　issue.　Herein,　we　devise　a　solardriven　self-powered　electrocatalytic　water　splitting　system,　which　employs　photovoltaic　cell　to　drive　micro　zinc-ion　battery　array　to　offer　a　stable　voltage　for　continuously　powering　the　seawater　electrolyzer.　Our　design　of　miniature　energy　storage　devices　not　only　harvests　high　energy　output　but　also　reduces　the　bulky　connection　degrees　of　thus-integrated　system.　More　impressively,　the　electrodes　based　on　earth-abundant　materials　show　case　multifunctionality,　which　is　reflected　in　the　good　electrochemical　performance　of　zinc-ion　battery　device,　the　impressive　electrocatalytic　activity　toward　overall　water　splitting,　as　well　as　the　robustness　to　resist　the　corrosion　within　alkaline　seawater.　Our　hybrid　system　would　open　up　agitated　ideas　for　the　continuous　acquisition　of　hydrogen　fuel　with　low　energy　consumption,　reasonable　cost　aspect　and　high　environmental　sustainability.