Flood forecasting method and device based on big data and medium

The invention relates to the technical field of flood forecasting, and discloses a flood forecasting method and device based on big data and a medium, and the method comprises the following steps: collecting bridge information which comprises bridge structure information; acquiring an elevation map and a remote sensing image of the bridge upstream; obtaining runoff production information caused by rainfall; generating hydrological features based on runoff production information and bridge information; the hydrological features, the elevation map of the bridge upstream and the remote sensing image of the bridge upstream are input into a flood prediction model, and the flood prediction model outputs a flood pixel matrix; marking a flood area on the remote sensing image based on the flood pixel matrix; giving an alarm to the early warning area covered by the flood area or evacuating residents in the early warning area; according to the invention, the flood caused by damming generated when floating objects are de