Refrigerator and unfreezing method for refrigerator

The invention discloses a refrigerator and an unfreezing method for the refrigerator. The refrigerator comprises a freezing chamber, a variable-temperature chamber and a refrigerating chamber which are arranged from bottom to top; an unfreezing chamber is further arranged above the refrigerating chamber, and the unfreezing chamber and the refrigerating chamber are separated through a thermoelectric refrigerating plate; and the thermoelectric refrigerating plate comprises a cold end, a heat insulation layer and a hot end, the cold end and the hot end are separated through the heat insulation layer, an aluminum base plate heat conduction insulating layer is arranged on the surface of the hot end, the hot end and the unfreezing chamber are separated through the aluminum base plate heat conduction insulating layer, and the aluminum base plate heat conduction insulating layer is further provided with cooling fins. According to the refrigerator, the hot end of the thermoelectric refrigerating plate is used for heat