The invention provides an unfreezing device, an unfreezing method and a refrigerator. The unfreezing device comprises a cavity, a
coupling window and a high-frequency generator, wherein the
coupling window is arranged on the side wall of the cavity, the high-frequency generator is used for generating high-frequency
waves, the high-frequency
waves enter the cavity via the
coupling window, and then multiple wave beams are emitted and irradiated to food to be unfrozen in the cavity so that the food can be unfrozen. According to the unfreezing device provided by the invention, all molecules of the unfrozen food bear the high-frequency
waves, the polarity of polar molecules is changed at a
high frequency, accordingly, the interior and the exterior of the unfrozen food are heated and unfrozen simultaneously, the temperature of the unfrozen food is uniform, the unfreezing speed is high, and the possibility of
pollution caused by microorganisms is reduced. Meanwhile, the food to be unfrozen is dissolved fast through a largest ice
crystal dissolution belt, the drop liquid loss is reduced, the loss of nutrients of the unfrozen food is effectively prevented, the quality of the unfrozen food is ensured, and large food can also be unfrozen, so that user experience is improved.