The invention discloses a single-electrical signal-stimulated rotation ultrasonic motor which comprises a mandrel, a group of piezoelectric ceramic sheets, a window-shaped staggered mode converter, a friction disk, a bearing, a spring and a nut, wherein the piezoelectric ceramic sheets, the window-shaped staggered mode converter, the friction disk, the bearing, the spring and the nut are sequentially sleeved on the mandrel, the piezoelectric ceramic sheets are connected with electrode sheets, the mandrel, the piezoelectric ceramic sheets, the electrode sheets and the window-shaped staggered mode converter form the stator part of the ultrasonic motor, the friction disk and the bearing form the rotor part of the ultrasonic motor, and the spring and the nut form a positive-pressure pretightening force adjusting mechanism of the rotor and the stator parts of the ultrasonic motor. In the invention, a single-electrical signal-stimulated working mode is adopted, the elliptical orbit motion of stator end surface particles is realized by utilizing the longitudinal vibration mode of the group of piezoelectric ceramic sheets, a rotor is driven to rotate, and the ultrasonic motor has simple control-driven system, easy manufacture, easy miniaturization and integration, low cost, small control difficulty and broad application prospect.