The invention discloses a washing machine which comprises an outer tub, an inner tub, a connecting disc, a floating sealing part and floater. The bottom of the outer tub is provided with a first center through hole. The inner tub is rotationally arranged in the outer tub. The bottom of the inner tub is provided with a second center through hole. The connecting disc is in sealed connection with the bottom of the inner tub. The connecting disc is separated from the bottom wall of the outer tub, so that a flow channel is formed. The floating connecting part is in an annular shape and extends in the circumferential direction of the connecting disc. The outer periphery of the floating connecting part is in sealed connection with the outer tub, and the floating sealing part can be converted between a sealed state and an open state. In the sealed state, the inner periphery of the floating sealing part is in sealed connection with the connecting disc as to close the flow channel; in the open state, the inner periphery of the floating sealing part is separated from the connecting disc so as to open the flow channel. The floater is arranged in the outer tub in the mode of being capable of moving in the vertical direction and used for driving the floating sealing part to close the flow channel when the water level of the outer tub is larger than a preset value. According to the washing machine, the floating sealing part and the connecting disc make contact and are sealed by feeding water into the outer tub to enable the floater to ascend, and sealing is convenient and reliable.