The invention provides a foam dedusting method, and a cyclone foam deduster. The foam dedusting method comprises following steps: liquid introduction, wherein liquid is introduced from one side of a tank body to the other side; gas introduction, wherein gas is introduced from the bottom side of the tank body to the top side of the tank body; measuring of the total amount of gas in the tank body, wherein the current flow amount of gas introduced into the tank body is obtained, the current flow amount of gas discharged from the tank body is obtained, and the total amount of gas in the tank bodyis calculated based on the time period of gas in the tank body; and heating, wherein the liquid in the tank body is heated based on the total amount of the gas in the tank body, so that solubility ofthe liquid on gas is reduced.