The invention discloses a precise loading piezoelectric linear motor and a driving method thereof, which can solve the problem that the current piezoelectric actuators are difficult to realize a largestroke and high-precision motion due to constraints such as the size, the weight, and the motion pair clearance. The piezoelectric actuator is composed of a base, a guide rail assembly, mounting screws I, a stator assembly, mounting screws II, a guiding mechanism, a baffle plate, fixing screws I, a thread pair and locking screws. The invention adopts the oblique force generated by a double ceramic folding beam flexible hinge and the exciting method for the piezoelectric actuator to comprehensively control the friction force, and has the characteristics of compact structure, convenient assembly, high positioning precision and large stroke, and can be widely used in the technical field of micro-nano precision drive and positioning such as precise optical instrument and semiconductor processing.