Abstract: In order to improve informationization level of coal mine water disaster prevention, and realize changes of mine water disaster prevention work from qualitative to quantitative and from experience to science, purpose and principles of construction of case base system of coal mine water disaster prevention and control under background of big data were proposed, and structure and function modules were designed. Key technologies of IoT, cloud computing, big data were analyzed. The case base system of coal mine water disaster integrates accident management, water disaster prevention, safety education and technical training.