Relief shading is an important part of large-scale battlefield simulation. Aiming at the problem that texture features of the existing relief shading technologies are not obvious in terms of details, this study proposes a large-scale battlefield relief shading enhancement method that combines elevation curvature and ambient occlusion. In the first step, by analyzing the curvature attribute of digital elevation data, a terrain curvature map is generated and then superimposed with satellite images to highlight geomorphic feature lines. In the second step, an ambient occlusion calculation method based on depthwise separable convolution is proposed, which can enhance the visual performance of battlefield terrain in gullies. Finally, the curvature map, ambient occlusion, and satellite images are fused to generate a real-time relief shading effect. Experiments show that the proposed method can present better visual effects on low-level global satellite images so that the observer can further analyze the texture features in terms of terrain details while grasping the overall trend of the three-dimensional terrain.