Model construction method and simulation method for pollution diffusion condition of water pollution accident

The invention discloses a construction method of a water pollution accident diffusion condition simulation model, a water pollution accident pollution diffusion condition simulation method, a device, equipment and a medium. The simulation method for the pollution diffusion condition of the water pollution accident comprises the following steps: acquiring simulation data of a water area to be simulated; inputting the simulation data into a water pollution accident diffusion condition simulation model; through a water pollution accident diffusion condition simulation model, within a preset time step, in a parallel calculation mode, calculating to obtain a water pollution accident pollution diffusion condition of the to-be-simulated water area at each target time point; wherein the water pollution accident pollution diffusion condition comprises the pollutant concentration and flow of each drainage basin of the to-be-simulated water area at each target time point. By means of the technical scheme, simulation of