The invention discloses an impeller-type aerator. The impeller-type aerator comprises a frequency conversion controller, a motor, a speed reducer, an impeller, supporting rods and whole-machine floating bodies, wherein the frequency conversion controller, the motor, the speed reducer and the impeller are sequentially connected, the speed reducer is connected with the whole-machine floating bodiesthrough the supporting rods, and the frequency conversion controller converts alternating currents into direct currents to output to the motor. The impeller-type aerator has the advantages that impeller-type aerator is not limited by three-phase electricity, energy and electricity are saved, the aeration effect is good, installation is convenient and rapid, and using is safer.