Photoelectric　properties　of　all-inorganic　perovskite　quantum　dots　(IPQDs)　highly　depend　on　their　synthetic　route.　However,　current　synthetic　processes　of　IPQDs　are　widely　facing　potential　unsustainable　issues　of　containing　nonreusable　and　high-cost　auxiliary　materials.　In　this　work,　full-visible-spectrum　IPQDs　were　successfully　synthesized　by　an　environmentally　friendly　ion-exchange　approach　with　a　renewable　and　low-cost　anion　exchange　resin.　Introducing　anion　exchange　resin　brings　the　improvement　of　both　optical　performance　and　surface　morphology　of　the　prepared　IPQDs.　The　emission　wavelength　of　IPQDs　can　be　precisely　controlled　without　changing　their　inherent　crystal　phase,　and　those　IPQD＇s　single　crystals　with　poor　morphology　and　unstable　structure　are　selectively　removed.　The　photoluminescence　quantum　yield　(PLQY)　and　the　fluorescence　lifetime　of　the　three-primary-color　IPQDs　can　be　dramatically　improved　to　93.69,　89.99,　and　65.03%　and　71.3　ns,　22.2　ns,　and　13.2　ns,　respectively.　Notably,　the　red-emitting　PQDs　at　622　nm　exhibit　a　record　high　PLQY.　By　using　the　prepared　IPQDs　for　photoluminescent　color　conversion,　the　three-primary-color　light-emitting　diodes　(LEDs)　provided　high　brightness　and　wide　color　gamut　simultaneously.　This　study　provides　new　ideas　for　the　environmentally　friendly　and　sustainable　synthesis　route　of　IPQDs,　and　it　is　expected　to　show　great　ambitions　in　the　display　field.　©　2022　Chenhui　Wang　et　al.,　published　by　De　Gruyter,　Berlin/Boston.