The environment of the invention provides a washing machine and a drying control method and device thereof and belongs to the field of home appliances. The drying control method of the washing machineincludes the steps of controlling a motor to drive a washing drum to rotate in order to execute drying operation; detecting the output power of the motor; under the condition that the output power ishigher than a preset output power threshold value, determining that there is too much foam in the washing drum and execution of defoaming operation is required. According to the provided scheme, effective detection of the situation that there is too much foam in the washing drum can be achieved, and and judgment errors caused by nonuniform distribution of foam in washing drums in the prior art are avoided.