Aiming at the requirements of small volume,light weight and strong current capability,a micro-servo driver with high power density was developed for UAV,manipulator and exoskeleton robot.Using high-density PCB stacked combination structure,efficient and fast switching technology,advanced three-ring PID control algorithm,on the basis of the existing conventional servo to carry out the technical breakthrough of miniaturization,high power density and easy installation.The experimental results show that all the inde-xes of the drive meet the requirements.