With the development of electric vehicles, more and more people choose electric vehicles as their means of transportation. Microwave radar and terahertz radar can be used to build safety assurance system for electric vehicles. However, both of the two technologies have the disadvantage of low stability. Infrared LiDAR has the advantages of high resolution, low cost and high reliability, but it has not yet been widely applied in the safety assurance system for electric vehicles. In this paper, we propose a safety assurance system for electric vehicles based on infrared LiDAR. In the design, infrared sensors are used for obstacle detection, and an MCU (microprogrammed control unit) is used for control. The excellent performance of the electric vehicle equipped with the safety assurance system in avoiding obstacles proves the high efficiency and high reliability of the system proposed in this paper. This experiment can deepen students\' understanding of the circuit system and cultivate their ability to construct the system independently, which can be of important meaning in their education.