Cleansing tank

A cleansing tank is provided. The cleansing tank includes an isolating device, a rotating axis and a rotating roller. The rotating roller comprises a polygonal cylinder, a first side surface, a second side surface and a plurality of curved partitions. A chamber of the rotating roller is divided into a plurality of subchambers, and each subchamber is defined by an outer surface of the polygonal cylinder, the first side surface, the second side surface and two adjacent curved partitions. When the rotating roller is rotated, the rotating roller can generate a centrifugal force, and the water in each subchamber can be drained from openings of the rotating roller by the centrifugal force and provide jet flows, thereby achieving better cleansing efficiency.