A descaling device is disposed in a washing machine for descaling. The descaling device includes a main body and a descaling assembly. The descaling assembly includes a connecting rod and a descaling rod which are connected to each other. The connecting rod is linked by the main body to rotate. The descaling rod is bent at an angle relative to the connecting rod. The descaling rod is a brush. The descaling rod is linked by the connecting rod to rotate for descaling. The descaling device can descale and clean a larger area of the inner and outer tanks of the washing machine efficiently.
