Abstract: The high-frequency phased array ultrasonic imaging system and its multi-elements high-frequency ultrasonic probe are complicated, costly, and difficult to implement. Therefore, the single-element mechanical scanning highfrequency ultrasonic imaging system has still high theoretical research and practical application value due to its simple structure, convenient implementation and low cost. However, the non-uniformity of mechanical scanning is the main obstacle to improving the performance of a mechanical scanning imaging system. Therefore, a high-frequency ultrasonic imaging probe with high precision mechanical scanning motion compensation is designed in this paper. High-precision scanning imaging is finally realized through theoretical calculation and analysis, structural design and processing, and the construction of scanning imaging system. The imaging experimental results of line target and imitation object show that after motion compensation, the system can effectively overcome the artifacts and distortion of traditional mechanical scanning imaging, the errors in transverse geometric position, longitudinal geometric position and area measurements are 1.34%, 1.33% and 3.15% respectively, which provides an effective means for the research on high-precision high-frequency ultrasonic imaging algorithm and system.