The invention relates to a large scale complex three-dimensional scene processing method based on the octree, belonging to the computer graphics and the virtual reality field, including the steps: (1) loading the large scale three-dimensional scene, organizing all the elements in the scene by the scene drawings; (2) building and generating the octree structure of the scene, recording the related information; (3) using the octree structure, performing the fast sight elimination through the crossing detection algorithm of the retinal cone body and the bounding box; (4) rendering the objects in the retinal cone body. The invention considers the deficiency to render the large scale complex three-dimensional scene when the present drawing renders the engine, uses the octree structure to organize the scene, cuts the geometrical nodes outside the retinal cone body by the space information and the tree structure, fast computes the node sequence required to render, reduces the number of the triangle surfaces transmitted to the rendering channels, thereby effectively advancing the rendering speed, reaching the realtime requirement.