Fuente: Wipo "precision agriculture" The invention discloses an urban ecological environment design method and system based on digital twinning, and relates to the technical field of urban ecological environment design, and the method specifically comprises the following steps: determining a water body management target and environmental conditions of an urban central park, and building a digital twinning model for simulating the pollutant diffusion and accumulation effect during seasonal rainfall; pollutant accumulation information of the urban central park during seasonal rainfall is collected in real time, and the collected pollutant accumulation information is transmitted to the digital twinborn model through the data interface; analyzing the pollutant accumulation information input into the digital twinborn model, and evaluating the pollutant accumulation risk level of the urban central park during seasonal rainfall; and according to an evaluation result, determining potential influence of pollutant accumulation on water quality, and starting corresponding water quality management measures. According to the invention, the problem of water quality deterioration caused by pollutant accumulation during seasonal rainfall is solved, and real-time monitoring and dynamic management of water quality are realized.