In recent years, with the continuous development and innovation of fintech, it also has a series of impacts on network security. This paper uses the literature review method to study the influence of fintech on financial industry network security and regulatory countermeasures. In the aspect of impact analysis, this paper first discusses the data security and algorithm risks brought by the extensive application of artificial intelligence. Secondly, the use of big data technology may lead to the risk of data leakage and abuse. Finally, lagging regulatory policies may increase security risks in the financial sector. In response to these impacts, this paper proposes four regulatory policies, such as strengthening data security and privacy protection, strengthening management efforts, balancing the relationship between innovation and risk, and introducing relevant policies. The study believes that effective regulatory measures can deal with the security challenges in the development of fintech, and ensure the stability of the financial system and the rights and interests of users.