Abstract: High-voltage multi-level technology has become a hot topic in biomedical and device physical properties. This paper proposes a new all-solid-state high-voltage multi-level generator structure. Compared with the traditional structure, the structure realizes the same level output with fewer switching tubes, which not only reduces the overall volume of the generator, but also saves cost and optimizes the electromagnetic compatibility of the system. In this paper, the structure design, working principle and control timing of resistive load and capacitive load are elaborated in detail. Finally, a maximum output 11-level tester is built. Experiments show that the high-voltage multi-level generator adopts improved type. Control timing can effectively eliminate the pre-pulse phenomenon, ensure the operating frequency of 2 kHz maximum amplitude ± 2 kV, stable operation in resistive and capacitive loads.