Linear piezoelectric driving device

The invention relates to a linear piezoelectric driving device which comprises a base 1, a stator 7, a sliding block 3, a linear guide rail 2 and a pre-tightening baffle 4, the stator 7 comprises eight symmetrically arranged cantilever beams 71, four cam-shaped contacts 72 and a stack of piezoelectric patches 6 fixed on the cantilever beams 71 are arranged on each side at equal intervals, and the piezoelectric patches 6 are symmetrically attached to the two sides of the cantilever beams 71 with opposite polarities. According to the invention, the piezoelectric bimorph is used for driving, and the stator works in a resonance state, so that the working efficiency is higher. Clamping and loosening actions are performed through the cam locking mechanism, single-harmonic control can be adopted, and accurate positioning can be performed without a rollback phenomenon in a working process. The two sliding blocks can independently move by controlling on-off of excitation voltage, and two different output ends can be c