The invention discloses a GIS (Geographic Information System)-based petrochemical enterprise gas leakage continuous dynamic simulation display method, which adopts an improved dynamic continuous smokeball integral gas diffusion model and can realize a dynamic simulation diffusion process of gas leakage along with time. Meanwhile, a petrochemical enterprise image and a vector layer are loaded; various condition parameters (such as a leakage source position, a leakage amount, a leakage rate, an environment wind direction, an environment real-time wind speed and the like) are integrated; the method is developed on the basis of an ArcGIS API (Application Programming Interface) for javascript and the like. Dynamic display and deduction of the gas leakage diffusion range of the petrochemical enterprise are realized, the possible diffusion influence range of the accident can be deduced at the first time after the leakage accident of the petrochemical enterprise occurs, and a reference basisis provided for personnel evacuation and accident emergency auxiliary decision making.