Sewage treatment tank

The utility model discloses a sewage treatment tank which comprises a tank body and a stirring motor arranged above the tank body, a stirring shaft of the stirring motor is downwards arranged in the tank body, and the sewage treatment tank is characterized in that a left chain track and a right chain track are respectively arranged at the left edge and the right edge of the tank body, and a movable bracket is arranged between the left chain track and the right chain track; a left chain wheel and a right chain wheel are arranged at the two ends of the movable support respectively and matched with the left caterpillar track and the right caterpillar track, and the left caterpillar track and the right caterpillar track are driven by a motor to drive the movable support to reciprocate in the caterpillar track arrangement direction. And a stirring motor is arranged on the movable bracket. Compared with the prior art before improvement, the chain track, the chain wheel and the movable bracket are arranged, the chai