Circular sedimentation basin for water treatment

The invention provides a circular sedimentation basin for water treatment. The circular sedimentation basin is characterized in that the basin is composed of a basin body (1) with a circular projection plane and a cylindrical filling material (2) installed in the basin body (1), and the cylindrical filling material (2) is formed by a plurality of connected fan-shaped water-passing units (3) which are obliquely arranged. The circular sedimentation basin for water treatment provided by the invention discards biases in traditional designs, produces an ideal effect through changing of a shape, overcomes the long-term vexing problem of yin and yang dead space in a sedimentation basin in the industry of water treatment and has the advantages of a simple structure, convenient construction and a high utilization rate of the filling material.