The present invention discloses a strong wind three-dimensional fluctuating wind farm comprehensive simulation method in a mountain landform. Most current simulation methods are only for a mountain of simple and regular shape, and are difficult to be promoted to a practical mountain landform that is more complex. The method comprises: for a target mountain landform, generating an accurate mountain landform model that meets an error requirement by combining GoogleEarth and Imageware software; calculating and obtaining a Reynolds stress of a monitoring point by using a CFD technology, and introducing the Reynolds stress into a stochastic fluctuating wind field generation technology, so as to obtain a three-dimensional fluctuating wind velocity field of the target mountain landform. According to the method disclosed by the present invention, in simulation of the three-dimensional fluctuating wind velocity field, point-by-point simulation is adopted without decomposing a cross-power spectrum matrix of huge order, so that requirements on computer hardware and software are greatly reduced. In addition, simulation can be performed for a specific and complex mountain landform, and an obtained result is better in suitability and accuracy than a simple and regular mountain model.