The research on data security based on blockchain and federated learning named a master's thesis entitled "Research and Application of Data Security Framework Based on Blockchain and Federated Learning". The topic of this master thesis combines the research and application of blockchain technology and federated learning in the field of data security. The word framework indicates that this paper will discuss a complete research framework, and the combination of research and application shows that both theoretical exploration and practical application are emphasized. Such a topic can better describe the research direction and scope of the paper. Master's thesis refers to an academic thesis completed at the postgraduate stage, which is the graduation thesis of master's degree. During the period of studying for a master's degree, graduate students need to conduct in-depth research and exploration according to their own research directions and topics, and submit the results as papers to tutors and schools for review.