An intra-frequency interference cancellation method, used to cancel interfering signals that are formed by a local transmit end and that interfere a local receive end, wherein the interfering signals comprise a first interfering signal received by a V polarization receive antenna and a second interfering signal received by an H polarization receive antenna, comprising: performing coupling to acquire a first reference signal and a second reference signal from a transmit signal transmitted on a same transmit link at the transmit end, wherein the transmit signal comprises a V polarization signal and an H polarization signal, and wherein the first reference signal is orthogonal to the second reference signal; performing signal recombination according to the first reference signal and the second reference signal, to obtain a first interference cancellation signal and a second interference cancellation signal, wherein a proportion of V polarization signals to H polarization signals in the first interference cancellation signal is adjusted to meet a first preset proportion, and a proportion of V polarization signals to H polarization signals in the second interference cancellation signal is adjusted to meet a second preset proportion; enabling the first interference cancellation signal to pass through a simulated interference channel, so that an amplitude and a delay of the first interference cancellation signal are the same as an amplitude and a delay of the first interfering signal respectively, and a difference between a phase of the first interference cancellation signal and a phase of the first interfering signal is an odd number times 180°, and enabling the second interference cancellation signal to pass through the simulated interference channel, so that an amplitude and a delay of the second interference cancellation signal are the same as an amplitude and a delay of the second interfering signal respectively, and a difference between a phase of the second interference cancellation signal and a phase of the second interfering signal is an odd number times 180°; and outputting, to a same receive link at the local receive end by means of coupling, the first interference cancellation signal and the second interference cancellation signal that have passed through the simulated interference channel, and combining the first interference cancellation signal and the second interference cancellation signal with a signal received by the local receive end. performing coupling to acquire a first reference signal and a second reference signal from a transmit signal transmitted on a same transmit link at the transmit end, wherein the transmit signal comprises a V polarization signal and an H polarization signal, and wherein the first reference signal is orthogonal to the second reference signal; performing signal recombination according to the first reference signal and the second reference signal, to obtain a first interference cancellation signal and a second interference cancellation signal, wherein a proportion of V polarization signals to H polarization signals in the first interference cancellation signal is adjusted to meet a first preset proportion, and a proportion of V polarization signals to H polarization signals in the second interference cancellation signal is adjusted to meet a second preset proportion; enabling the first interference cancellation signal to pass through a simulated interference channel, so that an amplitude and a delay of the first interference cancellation signal are the same as an amplitude and a delay of the first interfering signal respectively, and a difference between a phase of the first interference cancellation signal and a phase of the first interfering signal is an odd number times 180°, and enabling the second interference cancellation signal to pass through the simulated interference channel, so that an amplitude and a delay of the second interference cancellation signal are the same as an amplitude and a delay of the second interfering signal respectively, and a difference between a phase of the second interference cancellation signal and a phase of the second interfering signal is an odd number times 180°; and outputting, to a same receive link at the local receive end by means of coupling, the first interference cancellation signal and the second interference cancellation signal that have passed through the simulated interference channel, and combining the first interference cancellation signal and the second interference cancellation signal with a signal received by the local receive end.