The present invention is applicable to the communications field and provides a processing method for an orthogonal frequency division multiplexing (OFDM) signal and a network device. The processing method includes: obtaining an orthogonal frequency division multiplexing OFDM signal; multiplying, in a digital domain, the obtained OFDM signal by a simple harmonic wave whose frequency is fs to obtain a frequency shifted signal; and outputting and loading the frequency shifted signal by using a digital-to-analog conversion (DAC) to a driver and a modulator to send the frequency shifted OFDM signal.