The invention relates to a thin-diameter piston-type piezoelectric linear motor, comprising a tubular stator and a mover arranged inside the tubular stator. The stator comprises an upper and lower slender strip oscillators (the coupling heads at both ends of either oscillator are connected in a permanent manner, and the upper and lower lug bosses are arranged on both ends and supported on the inner wall of the tubular stator). The invention adopts a slender structure, and can be used for two-way driving and control; the invention is characterized in a simple structure and user-friendly functions.