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We designed and implemented a dynamic simulation platform for software defined optical satellite networking. It can simulate all nodes in satellite network on one computer. It can refresh the network in real time in a highly dynamic and complex environment, including changes in the connection between nodes caused by the dynamic periodic motion of the satellite and changes in link quality, etc. In addition, the platform can apply other algorithms in the simulation network so that the platform is practical and scalable. We also conducted the test of the small satellite constellation on this platform. The experimental results obtained are in line with expectations and reflects the practical capabilities of the platform.