The invention discloses an engineering BIM (Building Information Modeling) visual three-dimensional engine system, which comprises a terrain processing module, a three-dimensional engine module and athree-dimensional engine module, performing data format conversion and preprocessing on the terrain image data and the terrain DEM data; a model processing module; carrying out model lightweight processing on the multi-source model data; an engine rendering module; performing real-time optimization rendering on the multi-source model data, performing topology analysis, occlusion elimination and rendering sorting processing on the model according to specific parameters of a camera and a scene, and then outputting a three-dimensional rendering result frame by frame; a three-dimensional display module; and integrating the three-dimensional rendering result, and creating a three-dimensional interface to display the model to different terminal platforms. The three-dimensional engine system hasthe advantages that the model and terrain lightweight process is simplified, the three-dimensional rendering display efficiency is improved, meanwhile, the data format of the model is encrypted, and the safety of the model is guaranteed; and it is also ensured that the terrain model is clear and distortionless under the multi-scale condition.