Multicolor　electrochromics　have　emerged　as　a　promising　solution　for　achieving　active　color　modulation　akin　to　chameleon-like　adaptive　camouflage.　However,　the　development　of　electrochromics　with　full-color　tunability　still　remains　challenging,　given　the　weak　molecular　polarity　of　inherent　active　materials　and　the　difficulty　in　forming　polarizer　orbitals　under　varying　applied　voltages.　Employing　molecular　polarity　adjustments,　a　novel　electrochromic　polymer　is　successfully　developed　with　a　donor-gradient　design　of　molecular　architecture,　enabling　comprehensive　full-color　tunability.　The　polymer　demonstrates　outstanding　overall　electrochromic　performance,　including　fast　switching　(around　1.4　s),　high　coloration　efficiency　(395.1　cm2　C-1@550　nm)　and　excellent　reversibility　(over　92%　retention　after　5000　cycles).　Leveraging　the　full-color　tunability　and　rapid　response,　the　electrochromic　polymer　is　further　integrated　with　sensing　and　control　modules　to　create　an　environmental　adaptive　camouflage　prototype　system　capable　of　seamlessly　blending　colors　with　dynamic　background　environments.　This　work　is　expected　to　provide　a　straightforward　approach　for　developing　full-color　electrochromics　for　electrochromic　camouflage　applications.　An　electrochromic　polymer　with　donor-gradient　architecture　covers　the　full-color　gamut　and　enables　full-color　tunability.　This　is　the　first　time　to　deeply　explore　the　full-color　electrochromic　mechanism　in　this　material　system.　Leveraging　full-color　tunability　and　rapid　response,　the　electrochromic　polymer　is　integrated　with　sensing　and　control　modules　to　create　an　environmental　adaptive　camouflage　prototype　device,　seamlessly　blending　colors　with　dynamic　backgrounds.　image