Advanced　interfacial　engineering　is　essential　to　address　key　challenges　such　as　dendrite　formation,　parasitic　reactions,　and　sluggish　electrochemical　kinetics,　in　aqueous　zinc-ion　batteries.　In　this　study,　by　using　a　facile　self-assembly　method,　we　developed　an　armor-like　interfacial　layer　(ZSL)　on　the　Zn　surface,　serving　as　both　an　ion　re-distributor　and　a　protective　barrier.　This　compact　interfacial　layer　exhibits　suitable　hydrophilic　and　zincophilic　features,　enabling　consistent　and　uniform　Zn2+　flux　and　reducing　voltage　polarization.　The　ZSL　also　enhances　the　de-solvation　process,　speeds　up　zinc　deposition　kinetics,　and　suppresses　parasitic　reactions　induced　by　water　decomposition.　Furthermore,　it　decreases　the　surface　energy,　promoting　planar　deposition　of　Zn2+.　As　a　result,　the　modified　zinc　anodes　demonstrate　exceptional　cycling　stability,　maintaining　a　dendrite-free　surface　for　＞8000　h　with　minimal　byproduct　formation.　The　asymmetric　cell　utilizing　ZSL@Zn　anodes　exhibits　highly　stable　reversibility　over　6000　cycles　with　an　average　Coulombic　efficiency　(CE)　of　99.89　%.　In　full　cells　paired　with　Na2V6O16·3H2O　(NVO)　cathodes,　the　Zn-ion　batteries　exhibit　excellent　rate　performance　and　long-term　cycling　durability.　This　work　highlights　the　significant　role　of　in-situ　interfacial　layers　in　achieving　highly　stable　and　reversible　zinc　anodes　for　large-scale　zinc-ion　battery　applications.　©　2025　The　Author(s)