The invention relates to a triangular support of an inner drum. The triangular support comprises a body connected with the inner drum of a washing machine. One side surface of the body faces the innerdrum of the washing machine and the other side thereof is back to the inner drum of the washing machine. The position where the body contacts the inner drum of the washing machine is provided with aseal structure preventing washing water from entering an area between the body and the inner drum of the washing machine. The invention further relates to a roller washing machine equipped with the triangular support of the inner drum. The roller washing machine at least further comprises the inner drum of the washing machine. The bottom of the inner drum of the washing machine is equipped with aninstallation structure matching the triangular support of the inner drum. The triangular support of the inner drum is fixedly installed at the bottom of the inner drum of the washing machine. Additionally, the seal structure of the triangular support of the inner drum contacts the surface of the inner drum of the washing machine in order to form sealed connection. The seal structure is arranged between the triangular support of the inner drum and the inner drum of the washing machine such that a gap between the triangular support of the inner drum and the inner drum of the washing machine issealed. Therefore, the position between the inner drum of the washing machine and the triangular support of the inner drum is not likely to have dirt.