Abstract: In recent years, the per capita car ownership in China has been increasing continuously.At the same time, the green environmental protection concepts such as energy saving and emission reduction have also promoted the requirements of economy and environmental protection of automobiles.Under this background, promoting the development of automobile lightweight has become an important factor to solve related problems at present.In this process, the use of materials with low quality, high strength, strong shock absorption, corrosion resistance and fatigue resistance is the most important thing.Accordingly, this paper will take carbon fiber materials as an example, based on the application history of carbon fiber materials in the automotive field, analyze the current situation of lightweight design of new energy vehicles, point out its advantages and disadvantages, and then make a reasonable prospect for the future application of carbon fiber in lightweight design of new energy vehicles.