The invention discloses an automatic dew-eliminating device and a dew-eliminating method for door bodies of ice bars, and the ice bar comprises a glass door body, a box body, a refrigerating system and a control circuit, wherein the glass door body is composed of a door frame, a hollow glass, sealing strips. The hollow glass is a two-layer toughened glass, a layer of electrical heating coated glass is arranged between the two layers of the toughened glass, an electrical heating coating and two electrodes of the electrical heating coated glass are disposed on the surface of the glass, the two electrodes are in circuit connection with a program controller through two lead wires via a door body rotating shaft, and the outside of the glass door body is equipped with a humidity sensor. The humidity sensor can transmit an electrical signal to one program controller when the humidity sensor detects that the humidity of the door body reaches certain degree, and then the program controller controls the electrical heating coating on the door body to be in operation to evaporate the dew on the door body, thereby achieving the purpose of automatic dew-eliminating. The humidity sensor can return another signal to stop the dew-eliminating device when the humidity sensor detects that the humidity of the door body reduces to certain degree. The automatic dew-eliminating device has relatively perfect effect of dew-eliminating.