At present, the research of camera imaging simulation mostly has the problems of less imaging models and incomplete coverage, which is difficult to meet the simulation requirements of camera in complex observation conditions. Therefore, an imaging simulation scheme of space optical camera based on the combination of satellite tool kit and open scene graph was proposed. Satellite Tool Kit(STK) was used to establish the orbit parameters of the observed object and the camera, and through data import, 2D and 3D scene information of the observed object surface is created. Through the analysis and research of many influence models, the influence model is created in Open Scene Graph(OSG) to realize the camera imaging process simulation under complex observation conditions. The distributed technology was used to design the system structure and complete the development of the whole simulation system in modules. The experimental results show that the system can provide a good simulation environment for the imaging process of space optical camera under the influence of complex conditions, and provide powerful data support for the design and optimization of space optical camera.