The disclosure discloses a method for reducing mutual interference of multi-carrier, comprising: adjusting the delay of at least one modulation signal; respectively modulating each adjusted modulation signal onto each modulated signal; and comparing the performance indices of modulated signals with set performance indices, wherein the delay of at least one modulation signal is adjusted when the set performance indices are not reached, until the performance indices of modulated signals reach the set performance indices, and each current modulated signal is set as an output signal, or each current modulation signal is set as an input signal when the set performance indices are reached. The disclosure further discloses an apparatus for reducing mutual interface of multi-carrier. The disclosure can improve the performance obviously under the circumstance of arranging the multi-carrier adjacent to each other, and enable the multiple carriers to operate simultaneously in the coverage area of one radio signal, thereby greatly improving the frequency spectrum utilization ratio.