The invention discloses a detachable washing-machine inner-barrel dewatering structure and a washing-machine inner barrel. The structure includes an outer barrel, a washing barrel and a base, the bottom of the outer barrel is connected with the base, the inner cavity of the outer barrel is provided with the washing barrel, the top of the outer barrel is provided with a balance ring, an upper coveris installed at the top of the washing barrel, the edge of the upper cover is overlapped at the top of the balance ring, limiting blocks are arranged at the bottom of the upper cover at equal intervals in an annular shape, and connecting blocks are installed on the outer wall of the lower side of the upper cover at equal intervals in an annular shape. The upper cover and the washing barrel are connected through the four connecting blocks and limited by the four limiting blocks, so that a certain space is formed between the upper cover and the washing barrel, and water thus flows out along thegap between the upper cover and the washing barrel under the effect of centrifugal force at the time of dewatering. Compared with a previous water drainage method using holes, the water drainage space is large, the water drainage efficiency is thus effectively improved, and the structure is suitable for wide application and popularization.