A method for processing an interference signal, comprising: receiving a radio signal, wherein the signal comprises a self-interference signal of a transmit antenna, the self-interference signal comprises a first self-interference signal and a second self-interference signal, power of the first self-interference signal is greater than a first power threshold, a time delay of the first self-interference signal is less than a first time delay threshold, power of the second self-interference signal is less than the first power threshold and greater than a second power threshold, and a time delay of the second self-interference signal is greater than the first time delay threshold and less than a second time delay threshold; performing primary interference cancellation processing, by using a first reference signal, on the received signal to eliminate the first self-interference signal, wherein the first reference signal is obtained by coupling a local transmit signal; and performing secondary interference cancellation processing, by using a second reference signal, on the signal after the primary interference cancellation processing to eliminate the second self-interference signal, wherein the second reference signal is obtained by coupling a local transmit signal; wherein after the performing primary interference cancellation processing to eliminate the first self-interference signal, the method further comprises: performing low noise amplification processing on the signal after the first self-interference signal is eliminated; and the performing secondary interference cancellation processing, by using a second reference signal, on the signal after the primary interference cancellation processing comprises: performing the secondary interference cancellation processing, by using the second reference signal, on the signal after the primary interference cancellation processing and the low noise amplification processing. receiving a radio signal, wherein the signal comprises a self-interference signal of a transmit antenna, the self-interference signal comprises a first self-interference signal and a second self-interference signal, power of the first self-interference signal is greater than a first power threshold, a time delay of the first self-interference signal is less than a first time delay threshold, power of the second self-interference signal is less than the first power threshold and greater than a second power threshold, and a time delay of the second self-interference signal is greater than the first time delay threshold and less than a second time delay threshold; performing primary interference cancellation processing, by using a first reference signal, on the received signal to eliminate the first self-interference signal, wherein the first reference signal is obtained by coupling a local transmit signal; and performing secondary interference cancellation processing, by using a second reference signal, on the signal after the primary interference cancellation processing to eliminate the second self-interference signal, wherein the second reference signal is obtained by coupling a local transmit signal; wherein after the performing primary interference cancellation processing to eliminate the first self-interference signal, the method further comprises: performing low noise amplification processing on the signal after the first self-interference signal is eliminated; and the performing secondary interference cancellation processing, by using a second reference signal, on the signal after the primary interference cancellation processing comprises: performing the secondary interference cancellation processing, by using the second reference signal, on the signal after the primary interference cancellation processing and the low noise amplification processing.