The invention discloses a washing machine and a dehydration control method and a washing machine and dehydration control device. The washing machine comprises a washing barrel and a motor which drives the washing barrel to operate. The method comprises the following steps of: acquiring an operating power of the motor in real time when the washing machine enters a high-speed dehydrating stage; acquiring a power fluctuation value of the motor according to the operating power of the motor; and determining the eccentric degree of the washing barrel according to the power fluctuation value of the motor and adjusting the rotating speed of the motor according to the eccentric degree. When the washing machine hydrates at a high speed, the eccentric degree of the washing barrel is determined according to the power fluctuation value of the motor, and the rotating speed of the motor is correspondingly adjusted according to the eccentric degree, so that vibration and noise caused by eccentricity of the washing barrel when high-speed dehydration is performed, and the service life of the washing machine is prolonged.