Energy　storage　high-entropy　ceramics　are　famous　for　their　ultrahigh　power　density　and　ultrafast　discharge　rate.　However,　achieving　a　synchronous　combination　of　high　energy　density　and　efficiency　along　with　intelligent　temperature-monitorable　function　remains　a　significant　challenge.　Here,　based　on　high-entropy　strategy　and　phase　field　simulation,　the　polarization　response　of　domains　in　Bi0.5Na0.5TiO3-based　ceramics　is　optimized　by　constructing　a　concomitant　nanostructure　of　defect　dipole　polarization　and　a　polymorphic　relaxor　phase.　The　optimal　ceramic　possesses　a　high　recyclable　energy　storage　density　(11.23　J　cm-3)　and　a　high　energy　storage　efficiency　(90.87%)　at　670　kV　cm-1.　Furthermore,　real-time　temperature　sensing　is　explored　based　on　abnormal　fluorescent　negative　thermal　expansion,　highlighting　the　application　of　intelligent　cardiac　defibrillation　pulse　capacitors.　This　study　develops　an　effective　strategy　for　enhancing　the　overall　energy　storage　performance　of　ferroelectric　ceramics　to　overcome　the　problems　of　insufficient　energy　supply　and　thermal　runaway　in　traditional　counterparts.