This application relates to the field of wireless communication technologies, and discloses an antenna subarray, an antenna array, and a polarization reconfiguration method and apparatus, to provide a polarization reconfigurable antenna and a manner for performing polarization reconfiguration on an antenna. The antenna subarray includes m antenna elements. m is an integer greater than or equal to 2. The m antenna elements are placed at an interval of 360/m degrees in sequence. A distance between any two adjacent antenna elements is less than 0.5 times an operating wavelength. The distance between any two antenna elements is controlled within 0.5λ, so that polarization reconfiguration may be implemented. In addition, compared with a conventional array antenna, a polarization reconfigurable antenna including such an antenna subarray has a small antenna diameter and a small spacing, and may avoid generation of a grating lobe during large-angle scanning.