The invention relates to a linear ultrasonic motor stator clamping and locating and precompression exerting device and belongs to the technical field of ultrasonic motors. A groove is formed in a casing, the groove is structurally divided into a bottom layer groove and a top layer groove, slide seats are respectively arranged on the left side and the right side of the bottom layer groove, a stator clamping part is arranged between the two slide seats, a protrusion is arranged on the stator lamping part, a linear ultrasonic motor stator is fixed on the protrusion of the stator clamping part, and the linear ultrasonic motor stator is arranged in the top layer groove of the casing. One end of a spring sleeve is connected with a pre-tightening spring, the pre-tightening spring is connected with one end of a pre-tightening bolt, the other end of the spring sleeve is connected with the linear ultrasonic motor stator, the other end of the pre-tightening bolt is connected with a threaded through hole formed in the inner wall of the casing, a front cover plate is arranged at the front end of the casing through a locking bolt, and a casing cover plate is arranged on the outer side of the casing. The device can clamp and locate a linear ultrasonic motor and adjust precompression of the linear ultrasonic motor in assembling and is simple and convenient to operate. In addition, the motor can operate only by unlocking after being installed.