Here,　we　propose　a　facile　strategy　to　realize　all-solution-processed　highly　efficient　full-color-enabling　white　emitting　quantum　dot　light-emitting　diodes　(QLEDs)　at　ambient　conditions　by　using　low-cost　blade　coating　technique,　which　was　also　compatible　with　the　roll　to　roll　fabrication　process　for　large　size　production.　Firstly,　by　using　red　quantum　dots　(QDs)　as　the　representative　to　optimize　the　QDs　films　by　blade　coating,　the　QDs　films　exhibit　excellent　morphology　and　well-ordered　self-assembly　structure.　Then,　the　trichromatic　white　QLEDs　based　on　mixed　red,　green　and　blue　quantum　dots　were　obtained　with　Commission　Internationale　De　I＇Eclairage　(CIE)　coordinates　ranging　from　(0.42,　0.41)　to　(0.31,　0.33)　within　the　white　region　of　CIE　1931　when　driving　voltage　vary　from　5　v　to　8　v.　The　device　enjoys　excellent　optoelectronic　performance　including　a　maximum　luminance　of　11,465　cd/m(2),　a　maximum　current　efficiency　(eta(A))　of　9.2　cd/A　and　an　external　quantum　efficiency　(EQE)　of　3.7%.　In　addition,　3　x　8　cm2　white　QLEDs　with　bright　and　homogenous　light　emission　fabricated　by　blade　coating　are　demonstrated.　Our　strategy　for　fabricating　large-area　white　QLEDs　indicate　promising　applications　in　the　low-cost　solid-state　lighting　and　flat-panel　displays.