Structural　colors　generated　by　optical　micro-/nanostructures　offer　a　notable　advantage　over　traditional　chemical　pigments,　including　higher　purity,　greater　brightness,　resistance　to　fading,　and　enhanced　environmental　friendliness.　However,　achieving　dynamically　switchable　color　displays　with　high　performances　and　without　resorting　to　complex　nanofabrication　methods　remain　a　challenge.　Here,　we　present　a　simple　method　using　grayscale　lithography　and　conformal　coating　to　create　Salisbury　screen　(SS)　cavities　with　variable　resonant　wavelengths,　enabling　the　formation　of　tunable　colorful　patterns.　The　dynamic　color　display　is　achieved　through　the　phase　change　of　vanadium　dioxide　(VO2)　nanostructures　under　electrothermal　effects.　At　a　low　actuation　voltage　of　1.4　V,　high　performances　of　color　switching　such　as　high　sensitivity,　fast　speed,　high　repeatability,　and　wide-view　angle　are　achieved.　The　tunable　structural　colors,　featuring　a　simple　preparation　process　and　high-speed　switching,　represent　a　promising　alternative　for　applications　such　as　thermal　sensors,　security　information　encryption,　and　dynamic　full-color　displays.