Each industry is facing new challenges and opportunities, and many companies are embarking on a digital transformation journey to seek new breakthroughs and growth. Through the power of digitalization, they are actively attempting to transform their business models, enterprise operations, and business processes. The pandemic has had a certain impact on the hotel industry, but it has also provided an opportunity to accelerate the digitalization process of hotels. In the modern era, the hospitality industry has become more data-driven. As a result, hotels can leverage big data to enhance their daily operations, marketing, and customer experience. Hotels are now focusing on the digitization of guest experiences to improve service quality and enhance guest satisfaction. In this paper, the importance of using big data in hotel daily operations and marketing campaigns will be discussed. This research studies the digital transformation plan of the hotel industry through a literature review that provides the theoretical framework for further analysis. Then a case study approach is employed on The Ritz-Carlton Hotel Beijing, specific recommendations for using big data are proposed furtherly.