A refrigerator (10) comprising a defrosting device (200). The defrosting device (200) comprises: a cylinder body (210)； a device door body (220)； a radio frequency generation module (230)； a power-on polar board (240a) and a power-off polar board (240b)； and a detection module (250) The detection module (250) is configured to detect an incident wave signal and a reflecting wave signal of an electrical wire connecting the radio frequency generation module (230) and the power-on polar board (240a), and calculate the change speed of a dielectric coefficient of an object to be processed, so as to determine a defrosting speed of the object to be processed. In the present invention, the defrosting speed of an object to be processed is determined through a change speed of a dielectric coefficient of the object to be processed, and the accuracy is higher.
