With increased connectivity and the application of intelligent technologies, intelligent and connected vehicles are evolving rapidly, which offers new opportunities for vehicle data security risks. However, there are currently insufficient studies to comprehensively map the security risks throughout the life cycle of intelligent and connected vehicle data. The object of this paper is to identify the main data security risks at different data life cycle phases in the field of intelligent and connected vehicles, and the data security problems those risks may bring. The following are some of the techniques used to protect the security of data against risks. The test verification is implemented by using functional reproduction and data packet capture analysis. The results indicate that there are vehicle data security risks to personal information, including location and biometric information. This paper is useful for intelligent and connected vehicle data processors in their targeted application of technical and managerial measures to mitigate data security risks in the whole data life cycle.