Transparent　ceramics　with　high　piezoelectric　coefficient　(d33)　are　considered　as　ideal　candidate　materials　for　the　next　generation　of　intelligent　sensing　devices　due　to　their　unique　optical-mechanical-electrical　coupling　characteristics.　However,　synchronously　achieving　excellent　d33　and　optical　transmittance　in　ceramics　has　always　been　hindered　by　cross-scale　structural　contradictions.　Here,　we　propose　a　multiscale　reconfiguration　strategy　through　A/B-site　codoping　to　construct　small　domain　structures　with　broad　distribution　in　the　lead-free　K0.5Na0.5NbO3-based　ceramics,　which　are　induced　by　the　coexistence　of　orthorhombic　and　tetragonal　phases　along　with　submicron　grains.　The　results　indicate　that　the　optimal　ceramics　simultaneously　achieve　high　transparency　and　enhanced　piezoelectric　performance　(d33　=　180　pC/N　with　the　planar　electromechanical　coupling　factor　of　34　%),　originating　from　the　synergistic　effects　of　microstructural　engineering　(modulation　of　grain　size　and　density)　and　polarization　behavior　optimization　(via　increased　polarization　channels　and　reduced　energy　barrier).　Furthermore,　excellent　temperature　stability　(maintaining　90　%　of　d33　at　100　°C)　is　attained　with　the　incorporation　of　high　Curie　temperature　(332　°C)　and　wide　phase　distribution.　The　proposed　pressure-warning　smart　window　based　on　the　optimal　ceramic　exhibits　high　sensitivity　(3.98　nA/N),　wide　pressure　sensing　range　(5–20　N)　and　superior　mechanical　stability,　providing　critical　reference　for　novel　intelligent　sensing　devices.　©　2025　Elsevier　B.V.