A phase adjustment method for an antenna array, characterized in: dividing the antenna array into a first antenna subarray and a second antenna subarray according to a first division rule in a preset division rule set, wherein the preset division rule set comprises at least M-1 division rules, a value of M>=4 is a quantity of antenna array elements in the antenna array, and an antenna array element in the antenna array belongs to the first antenna subarray or the second antenna subarray; obtaining a phase difference between a first aggregated signal corresponding to the first antenna subarray and a second aggregated signal corresponding to the second antenna subarray; determining a to-be-adjusted phase value of each antenna array element in the antenna array according to the phase difference and a first weighting rule, wherein the first weighting rule is a weighting rule that is corresponding to the first division rule and that is in a preset weighting rule set, and the weighting rule is used to determine specific antenna array elements on which phase adjustments need to be performed and a relationship between the phase difference and a to-be-adjusted phase value corresponding to an antenna array element on which an adjustment needs to be performed; and sending, to a phase shifter corresponding to each antenna array element, the to-be-adjusted phase value corresponding to the antenna array element, wherein the first aggregated signal is a signal obtained by superposing signals that are transmitted by antenna array elements in the first antenna subarray and that are propagated through spatial channels, and the second aggregated signal is a signal obtained by superposing signals that are transmitted by antenna array elements in the second antenna subarray and that are propagated through spatial channels; or the first aggregated signal is a signal obtained by superposing signals received by antenna array elements in the first antenna subarray, and the second aggregated signal is a signal obtained by superposing signals received by antenna array elements in the second antenna subarray. dividing the antenna array into a first antenna subarray and a second antenna subarray according to a first division rule in a preset division rule set, wherein the preset division rule set comprises at least M-1 division rules, a value of M>=4 is a quantity of antenna array elements in the antenna array, and an antenna array element in the antenna array belongs to the first antenna subarray or the second antenna subarray; obtaining a phase difference between a first aggregated signal corresponding to the first antenna subarray and a second aggregated signal corresponding to the second antenna subarray; determining a to-be-adjusted phase value of each antenna array element in the antenna array according to the phase difference and a first weighting rule, wherein the first weighting rule is a weighting rule that is corresponding to the first division rule and that is in a preset weighting rule set, and the weighting rule is used to determine specific antenna array elements on which phase adjustments need to be performed and a relationship between the phase difference and a to-be-adjusted phase value corresponding to an antenna array element on which an adjustment needs to be performed; and sending, to a phase shifter corresponding to each antenna array element, the to-be-adjusted phase value corresponding to the antenna array element, wherein the first aggregated signal is a signal obtained by superposing signals that are transmitted by antenna array elements in the first antenna subarray and that are propagated through spatial channels, and the second aggregated signal is a signal obtained by superposing signals that are transmitted by antenna array elements in the second antenna subarray and that are propagated through spatial channels; or the first aggregated signal is a signal obtained by superposing signals received by antenna array elements in the first antenna subarray, and the second aggregated signal is a signal obtained by superposing signals received by antenna array elements in the second antenna subarray.