The invention discloses an OFDM system phase noise elimination method based on orthogonal polarization transmission, and belongs to the technical field of wireless communication. The OFDM system phase noise elimination method designs the transmitting terminal of an OFDM system, signals after traditional modulation are divided into two paths, conjugation is carried out in one path, and the signals are transmitted through an orthogonally polarized antenna after the orthogonally polarized states of the two paths of signals are given by the antenna; the signals are received through the orthogonal polarized antenna at a receiving terminal, after the conjugated signals are conjugated again, the two paths of signals are the same and are conjugated in phase noise, the two paths of signals are added, and then the imaginary part of the phase noise is eliminated, so that the phase noise item of multiplier interference can be approximate to 1, the influence of the phase noise on the received signals is eliminated, expected signals are obtained, and finally emit data information can be demodulated through a corresponding traditional demodulation method. The method solves the problems of high investment and price increment of terminal cost caused by the facts that the spectrum efficiency is low and a low phase noise local oscillator is redesigned in a self-elimination scheme.