The　spontaneous　parasitic　reactions　(hydrogen　evolution,　dendrite　growth,　etc.)　of　Zn　metal　hinder　the　commercial　application　of　aqueous　zinc　ion　batteries.　Herein,　a　highly　adhesive　zinc-ion　conductive　buffer　polymer　layer　is　constructed　using　polyvinyl　formal　(PVF)　to　prevent　these　parasitic　reactions　to　enhance　the　reversibility　of　Zn　deposition.　This　dense　artificial　buffer　layer　can　not　only　effectively　isolate　the　direct　contact　between　the　anode　and　the　electrolyte,　but　also　accommodate　volume　expansion　during　Zn　plating/stripping　and　guide　the　process　of　Zn　nucleation.　Specifically,　this　PVF　layer　increases　the　nucleation　overpotential　and　promotes　Zn2+　three-dimensional　diffusion　process　to　homogenize　the　Zn2+　flux　underneath　the　layer.　Hence,　the　PVF@Zn　exhibits　no　dendrites　and　high　cycling　stability　with　a　lifespan　of　5200　h,　which　is　a　35-fold　enhancement　compared　with　Zn,　and　can　even　run　at　an　ultrahigh　current　density　of　40.0　mA　cm(-2).　Moreover,　the　PVF@Zn||Na2V6O16　full　cell　maintains　a　specific　capacity　of　172.4　mA　h　g(-1)　(2400　cycles　at　1.0　A　g(-1)).　This　proposed　strategy　provides　a　practical　insight　into　designing　an　excellent-performance　Zn　anode　by　eliminating　the　parasitic　reactions　and　modulating　the　nucleation　of　Zn　deposition.