Although　porous　organic　cages　(POCs),　particularly　imine-linked　(CN)　ones,　have　advanced　significantly　over　the　last　few　decades,　the　reversible　nature　of　imine　linkages　makes　them　prone　to　hydrolysis　and　structural　collapse,　severely　limiting　their　applications　under　moist　or　water　conditions.　Herein,　seven　water-stable　hydrazone-linked　(CN-N)　POCs　are　prepared　through　a　simple　coupling　of　the　same　supramolecular　tetraformylresorcin[4]arene　cavitand　with　different　dihydrazide　linkers.　Their　structures　are　all　determined　by　single-crystal　X-ray　crystallography,　demonstrating　rich　structural　diversity　from　the　[2　+　4]　lantern,　[3　+　6]　triangular　prism,　and　unprecedented　[4　+　8]　square　prism　to　the　extra-large　[6　+　12]　octahedron.　In　addition,　they　respectively　exhibit　tunable　window　diameters　and　cavity　volumes　ranging　from　about　5.4　to　11.1　nm　and　580　to　6800　Å3.　Moreover,　their　application　in　the　water　environment　for　pollutant　removal　was　explored,　indicating　that　they　can　effectively　eliminate　various　types　of　contaminants　from　water,　including　radionuclide　waste,　toxic　heavy　metal　ions,　and　organic　micropollutants.　This　work　demonstrates　a　convenient　method　for　rationally　constructing　versatile　robust　POCs　and　presents　their　great　application　potentialities　in　water　medium.　©　The　Royal　Society　of　Chemistry.