The system dynamics (SD) model of urban waterlogging emergency management is established by using the method of SD. On the basis of determining the weight of the model variables, the dynamic simulation and sensitivity analysis of the event are realized by building the model equation and drawing the causal circuit diagram and the stock flow diagram of the waterlogging disaster event. The SD model is applied to the simulation analysis of a typical waterlogging disaster event in Xi'an. The results show that with the increase of time, increase the control of technical factors, social factors, management factors and natural factors, and the emergency management effect of urban waterlogging disasters tends to be better. Different variables in the SD model have different effects on the emergency management of urban waterlogging disasters. It is necessary to continuously improve the emergency plan, strengthen the construction of urban drainage network, and improve the timeliness of emergency decision-making.