An interference cancellation method, comprising: using a coupler to couple a part of a transmitted signal, inputting the part of the transmitted signal coupled by the coupler as a first transmitted signal into a first receiving filter, whereupon the first receiving filter inputs the first transmitted signal into a first transmitting filter, and inputting a part of the transmitted signal not coupled by the coupler as a second transmitted signal into a duplexer, wherein the duplexer comprises a second receiving filter and a second transmitting filter, wherein the first transmitting filter and the second transmitting filter are integrated on a same chip, or integrated on a same substrate, or integrated in a same package, or integrated in a same module, and an electric performance is uniform between the first transmitting filter and the second transmitting filter; inputting a first interfering signal, which is output from the first receiving filter, into an amplifier for amplification and then inputting the amplified first interfering signal into a phase regulator for undergoing 180° phase shift, and then inputting the obtained signal into the first transmitting filter, whereupon the first transmitting filter outputs the signal that has undergone the amplification and the 180° phase shift, wherein the first interfering signal comprises a signal leaked from the first transmitted signal to a receiving channel after the first transmitted signal flows through the first transmitting filter and the first receiving filter, the second interfering signal comprises a signal leaked from the second transmitted signal to the receiving channel after the second transmitted signal flows through the second transmitting filter and the second receiving filter, and the receiving channel is a channel for a receiver to receive signals; and combining the signals of opposite phases. using a coupler to couple a part of a transmitted signal, inputting the part of the transmitted signal coupled by the coupler as a first transmitted signal into a first receiving filter, whereupon the first receiving filter inputs the first transmitted signal into a first transmitting filter, and inputting a part of the transmitted signal not coupled by the coupler as a second transmitted signal into a duplexer, wherein the duplexer comprises a second receiving filter and a second transmitting filter, wherein the first transmitting filter and the second transmitting filter are integrated on a same chip, or integrated on a same substrate, or integrated in a same package, or integrated in a same module, and an electric performance is uniform between the first transmitting filter and the second transmitting filter; inputting a first interfering signal, which is output from the first receiving filter, into an amplifier for amplification and then inputting the amplified first interfering signal into a phase regulator for undergoing 180° phase shift, and then inputting the obtained signal into the first transmitting filter, whereupon the first transmitting filter outputs the signal that has undergone the amplification and the 180° phase shift, wherein the first interfering signal comprises a signal leaked from the first transmitted signal to a receiving channel after the first transmitted signal flows through the first transmitting filter and the first receiving filter, the second interfering signal comprises a signal leaked from the second transmitted signal to the receiving channel after the second transmitted signal flows through the second transmitting filter and the second receiving filter, and the receiving channel is a channel for a receiver to receive signals; and combining the signals of opposite phases.