The invention discloses a novel sewage stirring tank having a regulating function. The novel sewage stirring tank comprises a tank body and a water incoming pipe arranged at the upper end of the tankbody, a transverse plate capable of moving along the horizontal direction is arranged above the tank body, a second driving mechanism is arranged above the transverse plate and comprises an output shaft extending into the tank body, two stirring discs different in diameter are arranged on the output shaft, thickness of each stirring disc is gradually increased from inside to outside, a regulatingrod is arranged on each stirring disc, and one end of each regulating rod is connected with the corresponding stirring disc while the other end of the same is penetratingly inserted on the transverseplate; a moving block is arranged on the inner wall of the tank body and positioned below the water incoming pipe and can move on the inner wall of the tank body along the vertical direction, a waterdiversion plate is arranged on the side wall, facing the output shaft, of the moving block and connected with the moving block through a hinge, the moving block can rotate around the hinge, the waterdiversion plate is positioned below the water outgoing end of the water incoming pipe, and sewage in the water incoming pipe can flow onto the stirring discs through the water diversion plate.