Piezoelectric stepped bidirectional linear driver

The invention discloses a piezoelectric stepped bidirectional linear driver and belongs to driving machines. A screw centering casing is fixedly arranged at the outer part of a casing assembly; a rotor and a stator are configured inside the casing assembly; the stator and the casing assembly are fixedly mounted to form a whole by a bolt; the stator is connected with the rotor through a flexible rotor hinge; a driving piezoelectric device is arranged in a driving slot of the stator; two clamping blocks are arranged in a center hole of the rotor; the two clamping blocks are respectively connected with the rotor through flexible clamping hinges; a clamping piezoelectric device is arranged in a clamping groove of the rotor; a clamping nut is arranged between opposite parts of the two clamping blocks; a screw is arranged in a threaded hole of the clamping nut and can be inserted into the screw centering casing in an axial moving and circumferential and radial positioning manner; and a controller is used for respec