Embodiments of the present invention relate to a power adjustment device and method. A vectoring control entity VCE provided by embodiments of the present invention includes: a downlink FEXT determining module, configured to determine a power value of downlink FEXT caused to a signal on a line corresponding to a port i by a signal on a line corresponding to a port j, and a receive power value of an FTU-R corresponding to the port i; and a downlink receive power adjustment module, configured to: when the port i is activated, determine, according to the two power values determined by the downlink FEXT determining module, a virtual power margin corresponding to the port i and send the virtual power margin to the FTU-R corresponding to the port i.