PresentationGen is a web application developed on the SpringBoot framework that automates the creation of PPT files by integrating large language models (LLMs). This technology preprocesses a vast amount of single-page templates and combines them in real-time based on user needs for rapid generation of PPTX files. It supports text replacement, making the resulting presentations more personalized and professional. This tool is primarily aimed at users who need to quickly create presentations, such as business professionals, educators, and designers, helping them save time and enhance their work efficiency.