To enhance the vibration amplitude output and the ultrasonic energy delivery efficiency of the high-frequency ultrasonic transducer, a new type of flexible clamping high frequency ultrasonic transducer was proposed. Based on the modular design method, a systematic design method for this type of ultrasonic transducer was developed by combining the electromechanical equivalent method, four-terminal network, finite element analysis, and flexibility analysis. Then, a prototype was fabricated and an experimental platform was set up to test its electrical and dynamic properties. The excitation trial shows that the steady-state amplitude at the output end of the flexible clamping transducer is 38.55% higher than that of the traditional clamping transducer. The dynamic amplitude signal analyses in the time-and frequency-domain were carried out and the results show that by combining the flexible hinge-based mechanism with the traditional flange clamping structure and introducing a flexible rotating pair, the ultrasonic energy transfer efficiency of the flexible clamping transducer is improved by 5.16%, indicating that the flexible clamping flange can improve the motion decoupling ability of the clamping structure, presenting a good application prospect.