The invention discloses a method for virtually arranging a monitoring camera of a construction site based on a BIM technology. The method comprises the steps of building a three-dimensional model of the construction site; importing the three-dimensional model to three-dimensional design model software, thereby forming a spatial three-dimensional model; adjusting a view angle of the spatial three-dimensional model to a monitoring image needed to be monitored, and outputting imaging information and viewpoint information of the current monitoring image; and selecting a corresponding monitoring camera according to the imaging information, determining a mounting position of the monitoring camera according to the viewpoint information, and performing virtual arrangement of the monitoring camera of the construction site. According to the method, reasonable arrangement can be performed through the BIM technology; and the monitoring camera of the construction site is subjected to virtual and reasonable arrangement by utilizing a visualization characteristic and a simulation characteristic of the BIM technology, so that unnecessary waste of materials in a real mounting process is reduced, the mounting speed is increased, and the management cost is reduced.