The existing method for testing the new ultrasonic motor(USM) is to study the special test drive power supply. In order to avoid the influence of long development cycle and high material and labor cost caused by repetitive development of the drive power, the USM test drive power supply with wide range of voltage regulation is studied. Firstly, the relationship between transformer volume and loss and frequency is analyzed theoretically, and the power supply is determined as a transformer-less structure; then the boost equivalent circuit is analyzed to derive the upper limit of the boost ratio, and the adjustment of the duty cycle of the inverter circuit will lead to an increase in total harmonic distortion (THD). In summary, the test drive power supply topology is controlled by a controlled rectifier + boost circuit +half-bridge inverter three-stage circuit; a pre-configuration+automatic selective control strategy is proposed to solve the stability problem of cascade circuits. The test results prove that the test drive power can output 2 phase operating frequency of 10～100 kHz, phase difference within ±90°, and voltage amplitude of 20～600 V AC. Using TRUM60 and linear USM as the load, the test results prove that the test drive power supply can provide suitable drive signals and matching parameters for different USM, and the USM runs smoothly.