A thawing method for a thawing device, wherein the thawing device comprises a cavity defining a thawing chamber configured for placement of an object to be processed and having a forward opening, a device door disposed at the forward opening of the thawing chamber and configured to open and close the thawing chamber, a radio frequency generation module, an upper electrode plate and a lower electrode plate horizontally disposed on a top wall and a bottom wall of the thawing chamber respectively and electrically connected with the radio frequency generation module respectively, and a detection module configured to detect an incident wave signal and a reflected wave signal of an electrical connection wire connecting the radio frequency generation module to the upper electrode plate; the thawing method comprises: generating a radio frequency signal by the radio frequency generation module; obtaining the radio frequency signal; and generating, by the upper electrode plate and the lower electrode plate, radio frequency waves of corresponding frequency in the thawing chamber according to the radio frequency signal, and thawing the object to be processed in the thawing chamber; obtaining a voltage and a current of the incident wave signal and a voltage and a current of the reflected wave signal, wherein the method further comprises: calculating a change rate (Δε/Δt) of a dielectric constant (ε) of the object to be processed; and determining a thawing progress of the object to be processed, wherein the step of determining the thawing progress of the object to be processed comprises: obtaining the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed, wherein the step further comprises: determining whether the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed is greater than or equal to a first rate threshold; and if yes, reducing a working power of the radio frequency generation module by 30% to 40%. generating a radio frequency signal by the radio frequency generation module; obtaining the radio frequency signal; and generating, by the upper electrode plate and the lower electrode plate, radio frequency waves of corresponding frequency in the thawing chamber according to the radio frequency signal, and thawing the object to be processed in the thawing chamber; obtaining a voltage and a current of the incident wave signal and a voltage and a current of the reflected wave signal, wherein the method further comprises: calculating a change rate (Δε/Δt) of a dielectric constant (ε) of the object to be processed; and determining a thawing progress of the object to be processed, wherein the step of determining the thawing progress of the object to be processed comprises: obtaining the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed, wherein the step further comprises: determining whether the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed is greater than or equal to a first rate threshold; and if yes, reducing a working power of the radio frequency generation module by 30% to 40%. calculating a change rate (Δε/Δt) of a dielectric constant (ε) of the object to be processed; and determining a thawing progress of the object to be processed, wherein the step of determining the thawing progress of the object to be processed comprises: obtaining the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed, wherein the step further comprises: determining whether the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed is greater than or equal to a first rate threshold; and if yes, reducing a working power of the radio frequency generation module by 30% to 40%. obtaining the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed, wherein the step further comprises: determining whether the change rate (Δε/Δt) of the dielectric constant (ε) of the object to be processed is greater than or equal to a first rate threshold; and if yes, reducing a working power of the radio frequency generation module by 30% to 40%.