A base station antenna, comprising: at least two antennas, at least two outer cover structures, a fastening assembly, a connection assembly, and an upper cover, wherein each of the at least two antennas is independently packaged in a respective radome (3011, 3012); the fastening assembly comprises a pole and a base, and a bottom of the pole is mounted on the base; the connection assembly comprises an antenna connection assembly, an outer cover connection assembly, and a pole connection assembly, wherein the pole connection assembly is disposed on the pole, a top of each of the at least two antennas is connected to the pole by using the antenna connection assembly and the pole connection assembly, and a bottom of each of the at least two antennas is fastened on the bottom of the pole; each of the outer cover structures is connected to the pole by using the outer cover connection assembly and the pole connection assembly, and the upper cover is disposed on the top of the at least two antennas each of the outer cover structures and the at least two antennas are disposed alternately, an attachment portion (3021, 3022) on each side edge of each outer cover structure is attached to an outer side wall of the radome (3011, 3012), and an outer cover of the base station antenna comprises the outer side wall of the adjacent radome (3011, 3012), the at least two outer cover structures, and the upper cover; the antenna connection assembly comprises at least two bottom connecting pieces, each of the bottom connecting pieces is fastened on the bottom of a respective antenna of the at least two antennas, and a first fastening hole is provided on each one of the at least two bottom connecting pieces; and the base comprises an arc groove, a respective first bolt passes through the respective first fastening hole to fasten the respective bottom connecting piece to the arc groove, so that the respective first bolt is configured to move in the arc groove, and for each of the at least two antennas, an azimuth of a single antenna is adjustable by centering on the pole; and characterized in that a shielding ring (309, 3091, 3092) is disposed at a part connecting the radome (3011, 3012) and the base. the fastening assembly comprises a pole and a base, and a bottom of the pole is mounted on the base; the connection assembly comprises an antenna connection assembly, an outer cover connection assembly, and a pole connection assembly, wherein the pole connection assembly is disposed on the pole, a top of each of the at least two antennas is connected to the pole by using the antenna connection assembly and the pole connection assembly, and a bottom of each of the at least two antennas is fastened on the bottom of the pole; each of the outer cover structures is connected to the pole by using the outer cover connection assembly and the pole connection assembly, and the upper cover is disposed on the top of the at least two antennas each of the outer cover structures and the at least two antennas are disposed alternately, an attachment portion (3021, 3022) on each side edge of each outer cover structure is attached to an outer side wall of the radome (3011, 3012), and an outer cover of the base station antenna comprises the outer side wall of the adjacent radome (3011, 3012), the at least two outer cover structures, and the upper cover; the antenna connection assembly comprises at least two bottom connecting pieces, each of the bottom connecting pieces is fastened on the bottom of a respective antenna of the at least two antennas, and a first fastening hole is provided on each one of the at least two bottom connecting pieces; and the base comprises an arc groove, a respective first bolt passes through the respective first fastening hole to fasten the respective bottom connecting piece to the arc groove, so that the respective first bolt is configured to move in the arc groove, and for each of the at least two antennas, an azimuth of a single antenna is adjustable by centering on the pole; and characterized in that a shielding ring (309, 3091, 3092) is disposed at a part connecting the radome (3011, 3012) and the base.