A method and an apparatus for multiplexing an antenna element, and an antenna component can reduce power loss caused by multiplexing of the antenna element. The apparatus includes an antenna element, a filter, and a DUP. The antenna element is connected to the filter and the DUP separately, and a suppression band of the filter includes a bandpass band of the DUP. The filter is configured to filter the signals sent by the antenna element and the DUP and/or the signals to be sent to the antenna element and the DUP to make signals of a first band pass through. The DUP is configured to filter the signals sent by the antenna element and the filter and/or the signals to be sent to the antenna element and the filter to make signals of a second band pass through.