To effectively respond to unforeseen events like dam breaches and to mitigate potential disasters resulting from downstream flooding that threatens human lives and property, a thorough analysis and research of the reservoir flood warning system are crucial. This article delves into the current state of reservoir flood management in China, marked by insufficient emergency warning infrastructure, incomplete flood warning systems, and irregular emergency response practices. It conducts a comprehensive examination of China’s regulatory standards and practical implementations, encompassing the construction of the flood warning system, the delineation of responsibilities for managing flood impacts, and compliance with local regulations. Furthermore, this article offers a comprehensive summary and analysis of the existing reservoir flood warning systems in countries such as Switzerland, Japan, the United States, Australia, and the Netherlands. Drawing upon international experiences while considering China’s unique circumstances, the article presents a set of recommendations aimed at fortifying the reservoir flood warning system, advancing the development of flood warning facilities, increasing awareness and readiness for flood warnings, and standardizing the management of downstream flood channels in China.