A novel pulse sonoelectrochemical method for the size-controlled synthesis of conducting polymer microspheres was developed. This new methodology involves the deposition of conducting polymer microspheres on the electrode during the electric pulse, and then their exfoliation by the coming sonic pulse. In this system, the size of conducting polymer microspheres could be controlled by adjusting the electrolysis time. As a result, we have succeeded in preparing size-controlled conducting polymer microspheres ranging from 0.4 to 2.4μm in diameter. The electrochemical properties of the conducting polymer microspheres obtained by the present method were also investigated.