The　determination　of　trace　water　in　organic　solvents　has　been　a　long-standing　research　hotspot　and　is　still　evolving　which　requires　further　development.　Ratiometric　luminescent　sensors　with　rapid　response　and　accurate　visualization　of　water　assay　based　on　porous　materials　are　obviously　prospective　candidates　for　trace　water　detection,　but　remain　a　challenge.　Herein,　we　firstly　reported　a　novel　one-dimensional　(1D)　covalent　organic　framework　(COF,　labeled　as　FZU-68)　which　was　built　from　2-hydroxyisophthalaldehyde　(DIPh)　and　1,3,6,8-tetra(p-aminophenyl)-pyrene　(PyTTA).　The　COF　displays　comparative　high　specific　surface　area,　narrow　pore　size　distribution　and　prominent　chemical/thermal　stability.　Besides,　its　solid　state　displays　a　bright　red　emission　at　606　nm.　More　impressively,　due　to　a　water-induced　enol-keto　isomerization　in　its　structure,　the　fluorescence　of　FZU-68　quenched　in　response　to　trace　amounts　of　water,　which　sustain　the　limit　of　detection　(LOD)　in　acetonitrile　(MeCN)　up　to　0.05%　(v/v).　Besides,　FZU-68　could　be　utilized　several　times　in　the　above　trace　water　detection　experiments.　This　study　not　only　presents　the　feasibility　of　integrating　heteroatoms　and　functional　groups　into　1D　COFs,　but　also　sheds　light　on　the　application　prospects　of　COFs　in　the　field　of　chemical　sensing.