A flange seal installation mechanism at an inner drum bottom of a washing machine comprises an inner drum bottom (1), a flange (2) and a sealing ring (3). A surface, closely contacted with the inner drum bottom, of the flange, is provided with a circular limiting sinking groove (8), and the sealing ring is arranged in the limiting sinking groove in a locating and clamping manner. The sealing ring is of a flat circular structure and at least one ring of circular sealing convex ribs are arranged on the upper surface and/or lower surface of the sealing ring. The structure can ensure that no radial and movement deformation will be generated under the compression of a force, thereby ensuring the sealing effect between the inner drum bottom and the flange in the operating process of the washing machine.
