The invention discloses a generator for simulating navigation satellite reflected signals, comprising a common computer, an antenna, a navigation information module (3), an intermediate frequency signal generating module and a radio frequency module (2), wherein the navigation information module (3) and the intermediate frequency signal generating module are stored in the memory of the computer, the intermediate frequency signal generating module comprises a frequency spread modulator (1), a code digital control oscillator (4), a carrier digital control oscillator (5), a code delay generator (6) and a Doppler shift generator (7). The invention simulates the change of navigation satellite signals at a reflector surface or a reflector and generates the transmission time delay and Doppler shift of the reflected signals according to the change of the track of the receiver. The generator can test delay mapping receivers, to provide a new test method for the development of marine remote sensors and the utilization of reflected signals of global navigation satellite systems.