A high-precision three-dimensional automatic modeling method for a substation, comprising: collecting
laser point cloud data of a substation and multi-view images of the substation; performing dense
point cloud data registration, camera parameter reconstruction for the multi-view images, projection of the multi-view images, and adaptive
point cloud density control; using three-dimensional
Gaussian distribution functions to approximate the point
cloud data, summing all the three-dimensional
Gaussian distribution functions to obtain a
Gaussian distribution geometric field of a three-dimensional Gaussian distribution point cloud representation, and obtaining a three-dimensional
mesh model by means of three-dimensional mesh reconstruction and rendering; setting constraint conditions of devices on the basis of the three-dimensional
mesh model, and using a volume segmentation
algorithm and a three-dimensional labeling
algorithm to generate a three-dimensional device model, device coordinates, and device category names; and converting the device model into a GIM file, generating a PMS file from the device coordinates and the device category names, and
synchronizing the files to a GIM and PMS3.0. The present invention can effectively solve the problems of low efficiency and inconsistent quality in conventional manual modeling processes.