Synthesis　of　uniform　and　stable　electrochromic　films　on　a　conductive　layer　is　one　of　the　effective　ways　to　construct　high-performance　electrochromic　devices.　The　development　of　more　convenient　and　feasible　polymer　film　preparation　technology　is　important　and　necessary.　Herein,　we　demonstrated　the　development　of　a　continuous　in　situ　polymerization　method　to　prepare　electrochromic　film　on　ITO　glass　through　Schiff　base　condensation　of　a　tetraamine　Fe-based　complex　and　organic　di-/tri-aldehyde　precursors.　The　electrochromic　film　was　successfully　coated　on　the　surface　of　the　ITO　conductive　layer　and　exhibited　uniform　morphology　and　excellent　stability.　Film　P1　exhibited　two　reversible　redox　processes　allowing　two　steps　of　electrochromic　processes,　including　the　oxidation　of　Fe(II)　to　Fe(III)　at　1.05　V　and　oxidation　of　triphenylamine　moieties　to　cation　radicals　at　1.4　V,　which　induced　three　stable　color　states　from　initial　yellow　to　orange　red　and　blue.　The　utilization　of　the　so-formed　polymer　film　for　the　fabrication　of　electrochromic　devices　gave　rise　to　excellent　electrochromic　performance　of　fast　response　time　of　0.4-1.2　s　and　high　coloration　efficiencies　of　241.5-352.9　cm2/C　at　1.9　V　(at　535　nm)　and　2.5　V　(at　755　nm).　The　present　work　provides　a　new　feasible　strategy　for　constructing　polymer　films　for　high-performance　electrochromic　devices.