The present invention relates to an antenna mounting device configured to collectively mount a plurality of base station antennas on the same pole. The antenna mounting device comprises: a bracket (1) defining a central recess (4) in a mounted state, the central recess being configured such that the central recess (4) loosely receives the pole (3); a fastening device (2) configured to fasten the bracket (1) to the pole (3); and a plurality of connecting members (5), each of the connecting members being configured for connection with at least one of the plurality of base station antennas (6), and the connecting members having a predetermined relative position on the bracket. With such an antenna mounting device, the plurality of base station antennas can be mounted on the same pole at precise positions relative to each other.