The utility model provides a real -time satellite signal simulator of power line communication, simulator include receiving module, internet transmission module, wide band multicarrier modulation module, wide band multicarrier demodulation module, network receiving module, demodulation modulation module, radio frequency module and emission module, the outer satellite signal of receiving module receiving chamber, become digital intermediate frequency signal after handling, it carries out the data modulation to send the wide band multicarrier modulation module to at a high speed with the signalthrough internet transmission module, then give wide band multicarrier demodulation module through the power line with signal transfer, carry out the demodulation to the satellite signal for the demodulation modulation module signal transfer through network receiving module after the demodulation, the despreading, turn into simulation intermediate frequency signal after spread spectrum and the modulation, then be radiofrequency signal through the radio frequency module up -conversion, give signal transmission through emission module at last and surveyed the receiver use, the realization with the satellite signal by outdoor change over to over to indoor, and the SNR of improvement signal, make it still can be caught by the receiver after anti -interference processing.