The invention discloses a carrier frequency offset estimation and compensation scheme for a constant envelope frequency division multiplexing (OFDM) system using null subcarrier, and belongs to the field of wireless communication. The method comprises the following steps: performing FFT (Fast Fourier Transform) operation on a signal being subjected to phase demodulation at a receiving end to obtain a sequence including an available signal and frequency offset information; estimating the frequency offset by using a feature that the available signal includes the null subcarrier; performing compensation on the signal according to the estimated frequency offset; and performing phase demodulation, FFT, conjugate sequence deconstruction and symbol de-mapping on the signal subjected to the frequency offset compensation to obtain a received bit. Through adoption of the method, the problem of bit error rate increase caused by frequency offset is solved; an extra module does not need to be introduced; the complexity is relatively low; and the influence of the frequency offset on the system performance is effectively restrained.