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High-performance BaTiO3(BTO)-based dielectric ceramics have great potential for high-power energy storage devices. However, its poor temperature reliability and stability due to its low Curie temperature impedes the development of most electronic applications. Herein, a series of BTO-based ceramics are designed and prepared on the basis of entropy engineering. Owing to the incorporation of Bi(Mg0.5Ti0.5)O3, relaxation behavior and low dielectric loss at high temperatures have been achieved. Moreover, the high-entropy strategy also promotes lattice distortion, grain refinement and excellent resistance, which together increase the breakdown field strength. These simultaneous effects result in outstanding energy storage performance, ultimately achieving stable energy density (Ue) of 5.76 J·cm−3 and efficiency (
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