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Airborne experiment is an important way of GNSS-R ocean remote sensing. In order to solve the problem that GNSS-R airborne experiment requires huge manpower and material resources and it has a poor repeatability, this paper studied and designed a kind of GNSS reflected signal simulator, and the structure, flow chart, key parameters, components and user interface of the simulator were presented. This reflected signal simulator software based on the direct GNSS signal simulator, and both have direct signal channels and reflected signal channels parallel. Through analyzed the characteristics of navigation satellite reflected signal, and used a GNSS sea reflected signal model that is based on Z-V model, set time delay, doppler frequency and power parameters of airborne GNSS ocean reflection signal, to simulate more multiple reflections of different satellites. This simulator could generate two intermediate frequency files of direct and reflected signals respectively that can be send to GNSS-R software receiver. The simulation experiment results shown that the correlation coefficient between the Z-V model theory curve and the result of the reflection signal simulator is 0.9977, the reflected signals of simulator have a same correlated characteristic with the real signals, and it can according to the different parameters of user’s input analog output navigation satellite reflected signal.