The invention relates to a reconfigurable navigation satellite simulator. The reconfigurable navigation satellite simulator comprises a comprehensive information processing unit, a signal processing server group based on a GPU, an analog signal transceiving terminal group, a Ka/L up-down converter, a time-frequency terminal unit and a monitoring display computer. According to the reconfigurable navigation satellite simulator, demodulation and generation of L, S, Ka signals are realized by adopting the signal processing server group based on the GPU, and the reconfigurable inter-satellite and satellite-ground signal systems are realized; a Vxworks simulation environment is mounted by adopting a non-real-time operating system computer, and a time-frequency trigger signal is externally connected to simulate a real-time satellite-borne computer; and a UDP network protocol is adopted as a communication protocol between devices in the simulator, and effective data in a data domain is the same as a communication protocol between real satellite-borne devices.