A top-loading washing machine, comprising a housing , a drum with two ends enclosed being mounted in the housing ; a door body openable and closable being disposed on a side wall of the drum ; characterized in that the top-loading washing machine further comprises a drainage port formed in the side wall of the drum ; a sealing valve mounted at the drainage port ; a valve core of the sealing valve is subjected to centrifugal force to open the drainage port when the drum rotates at a high speed, and seals the drainage port when the drum rotates at a low speed or is stationary; the sealing valve comprises a valve plug pillar correspondingly mounted at the drainage port formed in the side wall of the drum , and a balancing weight hinged to an upper end of the valve plug pillar ; a sealing valve mounting structure is fixedly mounted on the side wall of the drum ; and a return spring is clamped between the sealing valve mounting structure and the valve plug pillar ; the sealing valve mounting structure comprises a supporting plate mounted on an inner side wall of the drum ; a middle portion of the supporting plate is provided with a through hole corresponding to the drainage port formed in the side wall of the drum ; a clearance is reserved between the supporting plate and the side wall of the drum to form a space for the valve core of the sealing valve moving up and down; a mounting sleeve is fixedly mounted on an upper side of the supporting plate ; an inner side through hole of the mounting sleeve is coaxially provided correspondingly to the through hole formed in the supporting plate , so as to mount the valve plug pillar of the sealing valve in the inner side through hole coaxially in a manner of being movable up and down. a housing , a drum with two ends enclosed being mounted in the housing ; a door body openable and closable being disposed on a side wall of the drum ; characterized in that the top-loading washing machine further comprises a drainage port formed in the side wall of the drum ; a sealing valve mounted at the drainage port ; a valve core of the sealing valve is subjected to centrifugal force to open the drainage port when the drum rotates at a high speed, and seals the drainage port when the drum rotates at a low speed or is stationary; the sealing valve comprises a valve plug pillar correspondingly mounted at the drainage port formed in the side wall of the drum , and a balancing weight hinged to an upper end of the valve plug pillar ; a sealing valve mounting structure is fixedly mounted on the side wall of the drum ; and a return spring is clamped between the sealing valve mounting structure and the valve plug pillar ; the sealing valve mounting structure comprises a supporting plate mounted on an inner side wall of the drum ; a middle portion of the supporting plate is provided with a through hole corresponding to the drainage port formed in the side wall of the drum ; a clearance is reserved between the supporting plate and the side wall of the drum to form a space for the valve core of the sealing valve moving up and down; a mounting sleeve is fixedly mounted on an upper side of the supporting plate ; an inner side through hole of the mounting sleeve is coaxially provided correspondingly to the through hole formed in the supporting plate , so as to mount the valve plug pillar of the sealing valve in the inner side through hole coaxially in a manner of being movable up and down. <EOS>