The invention discloses a washing machine, and a foam detection method and device of the washing machine. The method includes the steps: detecting torque values of a dewatering motor of the washing machine in real time when the washing machine executes a dewatering process; judging current dewatering stage of the washing machine; detecting foams in a dewatering barrel of the washing machine according to the current dewatering stage of the washing machine and the torque values. The method can effectively detect whether the foams in the dewatering barrel are excessive or not, so that corresponding defoaming measures are adopted when the foams are excessive, and safe and reliable operation of the washing machine is guaranteed.