This article explores how machine learning techniques can be used to drive digital authentication to prevent fraud in digital payment technologies. First, it introduces the development trend and fraud risk of digital payment technology, and then analyzes the limitations of traditional authentication methods, focusing on the potential of machine learning in digital authentication. It then explores specific application scenarios of machine learning in digital authentication, including data collection and preparation, feature engineering, model selection and training, as well as real-time monitoring and anti-fraud processing. Finally, current challenges and solutions are discussed, as well as the future of machine learning in digital payment technology. Through in-depth analysis of these contents, the article aims to provide readers with valuable insights to help them better use machine learning technology to improve the security and reliability of digital payments and promote the sustainable development of the digital economy.