Photochromic　(PC)　luminescent　ferroelectric　materials　have　aroused　great　interest　because　of　their　potential　applications　in　optical　information　memories,　optical　switches　and　bio-imaging.　However,　those　materials　are　basically　opaque.　In　this　work,　we　prepared　a　PC　luminescent　K0.5Na0.5NbO3-based　ferroelectric　transparent　ceramic　by　modifying　with　Eu3+,　Ba2+,　Ti4+　and　Sr2+,　which　not　only　have　good　optical　transmittances　(∼60%　at　900nm),　moderate　ferroelectric　properties　and　down-conversion　photoluminescence　(PL)　properties,　but　also　exhibit　reversible　PC　behavior.　After　the　illumination　by　xenon　lamp,　the　colors　of　the　ceramics　change　from　pale　green　to　gray,　and　then　reversibly　recover　to　their　initial　state　via　thermal　stimulus　(200°C　for　10min).　Interestingly,　both　the　optical　transmittances　and　PL　intensities　can　be　effectively　tailored　by　controlling　the　PC　reaction　process.　The　results　suggest　that　the　ferroelectric　transparent　ceramics　are　promising　for　the　modulation　of　photoenergy　and　the　design　of　optoelectronic　devices.　©　2019　The　Author(s).