The invention discloses a liquid-based large-area ferroelectric film polarization turnover apparatus. The apparatus comprises a signal generator, a counter electrode, a substrate, a bottom electrode formed on the substrate, a ferroelectric film formed on the bottom electrode, a container and a liquid, wherein the counter electrode, the substrate, the bottom electrode and the ferroelectric film are all placed in the liquid in the container; the bottom electrode is grounded through a wire; the connecting position between the bottom electrode and the wire is not in contact with the liquid; the counter electrode is connected with the signal generator through the wire; and the signal generator is placed outside the container. By adoption of the apparatus, complete large-area ferroelectric film polarization turnover in a back and forth manner can be realized; in addition, the surface structure of the ferroelectric film is not damaged in the turnover process; the turnover process is simple and convenient and easy to realize, the apparatus is low in cost, and wide industrial application can be realized conveniently.