Population aging is a common problem facing all mankind in the twenty-first century. The intelligent wheelchair with stair climbing and obstacle crossing function developed and designed in this paper aims to provide daily life assistance for the elderly and realize functions such as stair climbing and obstacle crossing. Population aging is a common challenge faced by humanity in the twenty-first century. The intelligent wheelchair developed and designed in this article is aimed at providing daily life assistance for the elderly, with features such as stair climbing and obstacle crossing. The wheelchair is modeled based on human body dimensions, and a combined wheel-leg stair climbing scheme is designed, which alternately supports the structure with two types of supporting mechanisms. Strength analysis and modal simulation were conducted using ANSYS simulation software, and the final simulation results indicate that the design meets the strength requirements.