On the basis of digital technology，through the process of storing，organizing，managing and processing the engineering geological data，it can make a comprehensive analysis and evaluation of the disaster risk of the geological problems or disasters of the project site area，which provides disaster prevention and control of water conservancy construction or safety data and technical support.In hydraulic engineering in this paper，the geological big data processing method and discusses the concrete application research，disaster prevention and mitigation of water conservancy project is of great significance.