Abstract: Aiming at the problems of non-standard display, inconsistent content styles, inconvenient operation, insufficient interactivity, and inadequate data security in railway passenger announcements, this paper designed and implemented a railway passenger transport announcement management system. The paper adopted Netty-SocketIO technology to construct an Internet of Things connecting terminal large-screen devices and passenger management services, and realized efficient real-time communication. Relying on the online document rendering engine, the system implemented content parsing and display for document formats such as PDF and Word. It adopted domestic digital signature technology to improve the anti-tampering capability of data, deployed intelligent cryptographic key devices to realize hardware-level security protection, and introduced HTTP streaming response technology to solve the generation and parsing challenges of ultra-large JSON data packets. Test results and pilot applications show that the system achieves standardized and unified display of announcement content, optimizes passengers’ viewing experience of announcements, and provides a practical and reliable technical solution for the application and display of railway announcements.