Near-surface typhoon wind field simulation is a key method for high-precision typhoon hazard assessment and is of great significance for disaster forecast, loss risk assessment and emergency management. The terrain correction method for regional large-scale wind field simulation has a single correction method, which cannot satisfy the requirements of refined risk assessment. This paper aims to use the accuracy advantage of the fluid dynamics mechanism model (CFD, computational fluid dynamics) in small-scale wind speed simulation and obtain a terrain correction method suitable for regional large-scale wind field simulation by extracting the spatial change law of the wind speed under complex terrain. Among them, typical mountains with different cross-sectional shapes and different slopes are used to characterize the undulating terrain, and the CFD model is used to simulate and analyze the wind speed changes on the upwind slope, mountain top area, leeward slope, and downwind area under different initial wind speeds. The wind speed at these locations has a good quantitative relationship with the initial wind speed. Combined with the common building wind load codes in China, the wind speed correction algorithm suitable for large-scale complex terrain has been supplemented and improved. Taking Typhoon 0713 as an example, a near-surface typhoon wind field simulation was performed. Compared with other models, the accuracy of the simulation results of terrain correction by the method provided in this article has increased by 15-19.9%. The CFD-based typhoon disaster near-surface wind field can more accurately reflect the spatial distribution and intensity of typhoon wind hazards under large-scale complex terrain. It can provide technical support for the loss risk prediction and assessment of forest resources, mountain forestry economy, crops and other disaster-bearing bodies in typhoon disasters.