With the continuous development of web technology, Web 3.0 has attracted a considerable amount of attention due to its unique decentralized characteristics. The digital economy is an important driver of high-quality economic development and is currently in a rapid development stage. In the digital economy scenario, the centralized nature of the Internet and other characteristics often bring about security issues such as infringement and privacy leakage. Therefore, by exploring the digital economy and Web 3.0, it is necessary to investigate how to use Web 3.0 technologies to solve the pain points encountered in the development of the digital economy. In this paper, we discuss the aspects of Web 3.0 that should be integrated with the digital economy to better find the entry point to solve the problems by examining the latest advances of Web 3.0 in machine learning, finance, and data management. We hope this research will inspire those involved in academia and industry and help build a favourable ecology for the digital economy.