A　metal–organic　framework　(MOF)　thin　film　constructed　from　Zn　nodes　and　naphthalenediimide　(NDI)　linkers　was　grown　in-situ　uniformly　on　a　transparent　conducting　glass　substrate.　This　transparent　thin　film　exhibits　intriguingly　high-contrast　electrochromic　(EC)　switching　between　canary　yellow　and　dark　brown　by　means　of　a　one-electron　redox　reaction　at　its　NDI　linkers.　The　findings　provide　a　basic　comprehension　of　the　relations　between　redox　state　and　electrochromism　and　enrich　the　application　of　MOF　in　the　field　of　optoelectronic　materials.　©　2021　Elsevier　Inc.