The traditional switched-inductor technique for high-step-up conversion is widely utilized in industrial applications, especially, multi-cell technique is combined to realize ultra high voltage. However, the component currents are accordingly increasing with the increasing number of cells, which results in high-cost, low-efficiency and low-stability. In order to solve these problems, an improved multi-cell structure of switched-inductor is devised, which can be utilized to replace traditional switched-inductor cells for higher actual boost ratio and lower diode currents. An example of the proposed structure based boost converter is demonstrated for a detailed analysis, and it is followed with a comparison to verify its features. Finally, simulations and experiments are conducted to validate the effectiveness.