In order to improve the effective drive of double-feet piezoelectric linear actuator and enhance magnifying ability of micro-displacement structure of secondary lever and flexure hinge in actuator, structural parameters of the actuator areoptimized. Firstly, the amplification of secondary lever micro- displacement mechanism is calculated theoretically, and the simulation process of the actuator stator is completed based on ANSYS. Secondly, through the simulation analysis, it is found that the comprehensive use of straight circular flexure hinge and straight beam flexure hinge in the actuator stator can optimize the magnification of the actuator stator, and the corresponding magnification of the optimal hinge parameter is 8.131. Thirdly, the prototype of the actuator is made and the amplitude of the stator driving foot is tested, and vibrations of two driving feet are relatively stable. The experimental results show that the displacement amplitude of driving foot I and II floats in the range of 60 and 63μm. Compared with the existing piezoelectric linear actuator, the actuator has advantages of simple structure, easy installation and debugging, and high stable operation.