The invention provides a lossless service multi-carrier-wave frequency spectrum transfer method and an apparatus. The method comprises the steps of obtaining frequency spectra of standby carrier waves in a web master and carrier waves to be transferred in a target carrier wave group, generating the standby carrier wave according to the frequency spectra of the standby carrier wave; and sending transfer instructions to a piece of opposite-end network equipment and responding to the transfer instructions from the opposite-end network equipment. The response is used for determining the network equipment on the two ends can execute frequency spectrum transferring. The method further comprises the steps of sending transfer signals to opposite-end network equipment; receiving transfer signals sent from the opposite-end network equipment, and switching overhead information and services born on the carrier waves to be transferred in the target carrier wave group according to the transfer signals. After the services born on the carrier waves to be transferred are transferred to the standby carrier waves, idle frequency spectra corresponding to the carrier waves to be transferred and adjacent idle frequency spectra form a continuous idle frequency spectrum area to satisfy new service demands for a frequency spectrum width.