Sewage treatment device

The utility model provides a sewage treatment device which comprises a rotating shaft, the rotating shaft is externally connected with a motor, the rotating shaft is a screw, threads are arranged on the rotating shaft, the rotating shaft is in threaded connection with a transition piece, and the transition piece comprises a circular ring arranged on the rotating shaft in a sleeving mode, a limiting block fixedly connected to the outer surface of the circular ring and a fixing block connected with the limiting block. A stirring rod is fixedly connected to the fixing block, the rotating shaft is sleeved with a limiting rod, the lower end of the limiting rod is fixedly connected with the bottom of the treatment pond, a through long groove is formed in the limiting rod, and the limiting block penetrates through the long groove and can slide in the groove. Through the arrangement of the transition piece, when the stirring shaft is driven by the motor to rotate, the transition piece slides along the long groove, th