The invention relates to an 
impeller aerator, which comprises a motor, a reduction box, an 
impeller, a support rod, and a floating body, wherein the motor is vertically arranged on the reduction box; a decelerated output shaft is stretched out downwards; a 
flange is arranged on an end part of the output shaft and is connected with a fixed seat of the 
impeller; three basically uniformly distributed joints are arranged on the outer side of the reduction box; the support rod is fixed on the joints; a connecting seat is provided with an inner hole matched with a steel 
pipe; a locating hole intersected with the inner hole is arranged on a side face of the connecting seat; a hexagonal through hole is arranged on one side of the locating hole; a circular through hole is arranged on the other side of the locating hole; a hexagon head of a hexagon bolt enters into the hexagonal through hole; the connecting seat is fastened with the steel 
pipe through the hexagon bolt; a fixed ring I is arranged on the other end of the steel 
pipe; the fixed ring I is fastened with the steel pipe through base plates with two holes and two bolts; at least one base plate with two holes is provided with a fixing ring II; the support rod is fixed on the joints through the 
flange of the connecting seat; the floating body is fixed in the fixed ring I; a 
rope for fixing the aerator is fixed in the fixing ring II and is hung on a 
metal fixing ring; and the plastic fixing ring I and the floating body are not stressed, so that the connection is reliable and firm.