Disclosed are a BiFeO3-Bi0.5Na0.5TiO3-based ceramic solid solution having room temperature magnetoelectric coupling, a preparation method therefor and an application thereof. The chemical composition of the ceramic solid solution is (1.0-x-y)BiFeO3-xBi0.5Na0.5TiO3-yCaTiO3, wherein x=0-0.3 and y=0-0.4. The preparation method comprises: (1) accurately weighing a bismuth source, an iron source, a sodium source, a titanium source and a calcium source according to the stoichiometric ratio of (1.0-x-y)BiFeO3-xBi0.5Na0.5TiO3-yCaTiO3; (2) adding a raw material to a mixed solution of glacial acetic acid, acetylacetone, a complexing agent and ethanolamine, and stirring same to obtain a clear sol; (3) first drying the sol, and then pre-sintering same to obtain a precursor powder; (4) grinding the precursor powder and then pressing same to obtain a ceramic sheet; and (5) sintering the ceramic sheet for a second time, and quenching same after sintering so as to obtain a BiFeO3-Bi0.5Na0.5TiO3-based ceramic solid solution having room temperature magnetoelectric coupling. The BiFeO3-Bi0.5Na0.5TiO3-based ceramic solid solution having room temperature magnetoelectric coupling provided in the present invention has a stable structure and excellent electrical properties, magnetic properties and magnetoelectric coupling properties, and may be applied in a sensor or a memory; in addition, the preparation method of the present invention is simple.
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