Abstract: Nowcasting and early warning of flash floods is an important part of the multi-stage progressive flash flood monitoring, forecasting and early warning system, and it is the main technical means to carry out flash flood defense work at the national level. The Disaster Reduction Center (Flood and Drought Defense Center) of the Ministry of Water Resources has developed and improved the nowcasting and warning model, and timely issued nowcast and warning relying on the national flash flood monitoring, forecasting and warning platform, which provides strong support for the national level to grasp the national flash flood disaster situation in the first time, and to supervise and guide the local governments to do a good job in flash flood disaster defense work. The study summarizes the work of flash flood disaster forecasting and early warning at the national level in 2024, introduces the technical methods of flash flood disaster forecasting and early warning and the application effect during the flood season of 2024, analyzes the existing problems, and puts forward the next steps to enhance the measures of flash flood disaster nowcasting and early warning.