The invention discloses a straight line and rotation
coupling-out type piezoelectric driving device which comprises a
pile mounting seat, straight pins, a piezoelectric
pile, strain foils, an
invar sheet, a
steel ball, a
coupling-out component and an output shaft, wherein the strain foils are attached to the side surfaces of the piezoelectric
pile, the bottom surface of the piezoelectric pile is adhered to the pile mounting seat, and the top surface of the piezoelectric pile is adhered to the
invar sheet and is contacted with the
steel ball inside an output shaft ball socket; the top of the
coupling-out component is in interference nesting with the output shaft, and the bottom of the coupling-out component and the pile mounting seat are positioned with the straight pins and fixed with holding screws; after the piezoelectric pile applies
voltage, the output shaft and the top of the coupling-out component are pushed to extend together along the axial direction; and because of the deformation coupling characteristics of the coupling-out component, the top of the coupling-out component and the output shaft rotate with a certain angle around the axial direction at the same time, and the angle is in direct proportion to the
axial elongation. Output of straight line and rotary motion can be carried out in the axial direction at the same time, and the device has the advantages of being simple in structure, easy to control, large in angle rotation range, and high in displacement and angle rotation precision.