According to the demand of high-frequency and high-precision jet tube servo valve in aviation industry, a piezoelectric stack-driven jet tube servo valve was designed. The principle of the servo valve was analyzed. The jet zone of the servo valve and the characteristics of the slide valve were studied. The dynamic model of the servo valve was established. The piezoelectric stackdriven jet tube servo-valve and the traditional electromagnetic jet tube servo-valve were compared and analyzed by simulation test. The simulation results show that the response speed of the designed piezoelectric stack-driven jet tube servo valve is 08 ms higher, the frequency response is increased by 5 times, the stability is better, the control precision is higher than that of the electromagnetic jet tube servo valve, and the displacement of the slide valve can reach the demand. The designed piezoelectric jet tube servo valve provides a new method for improving the conventional jet tube servo valve.