The invention discloses a method for estimating a DOA-BF weight of a dual-polarized antenna system. The method comprises the following steps: carrying out channel estimation on an uplink channel to calculate an uplink steering vector; obtaining DOA information according to an uplink channel estimation value and the uplink steering vector; and generating a downlink transmission weight via the DOA information. The invention further provides a device for estimating the DOA-BF weight of the dual-polarized antenna system. The method for estimating the DOA-BF weight of the dual-polarized antenna system provided by the invention is used for solving the situation that when being applied to DOA-BF weight estimation, the existing DOA information cannot be merged in the same phase is solved, and the system performance is effectively improved.