The piezoelectric actuator uses the piezoelectric effect to convert the voltage into the displacement output of the micro and nano level, which can not only produce high-precision displacement output, but also produce the thrust of the thousand cattle level. By applying the piezoelectric ceramics with the characteristics of deformation (elongation, contraction) of the applied voltage, it is widely used in precision positioning, drive control, vibration noise reduction, etc. It can control the size and frequency of voltage to achieve mechanical vibration, displacement, deformation and other purposes.