The invention belongs to the field of washing machines and particularly relates to a washtub of a washing machine, the washing machine and a control method. The washtub comprises a circulating water channel, the washing machine comprises an impeller arranged in the washtub, the impeller rotates to enable washing water in the washtub to enter the circulating water channel from a water inlet under the action of centrifugal force and return to the washtub from a jet port of the circulating water channel, the circulating water channel comprises a water guide section close to one end of the water inlet, and the section of the water guide section in the direction perpendicular to the water flow direction is unchanged. The washtub has the benefits as follows: the washtub comprises the circulatingwater channel, during washing or rinsing, the washing water is jet circularly by use of the circulating water channel, and the washing effect is improved. The water guide section is designed into thestructure with the unchanged section, the number of pressure relief points is reduced, the jet strength is improved, and the anti-winding capacity and the washing rate are improved.