The invention provides a power system three-dimensional device scene modeling method which comprises the following steps: establishing all sorts of three-dimensional device assembly models in the three-dimensional scene by adopting the virtual technology; uploading the three-dimensional device assembly models into a three-dimensional assembly library through a client side; accessing to a server side through the client side, and acquiring the three-dimensional device assembly models needed by the three-dimensional scene modeling from the three-dimensional assembly library; building a three-dimensional device scene model by adopting the three-dimensional device assembly models; guiding the built three-dimensional device scene model into a power system simulating system, and carrying out simulating training and visual display or virtual test. Because the modeling process comprises the assembly modeling stage and the scene assembling stage, the scene modeling difficulty is reduced, the scene modeling efficiency is improved, the models have high reusability, particularly the team can carry out modeling cooperatively, the position of the device assembly is accurate in the virtual scene, the later maintenance workload is low, and the later maintenance process is simple and not difficult.