The embodiment of the invention discloses a dual-system co-antenna feeder base station antenna, which comprises a radiation antenna array layer consisting of at least one linear antenna array, wherein the linear antenna array comprises a plurality of first system compound radiation array elements and second system compound radiation array elements; and each linear antenna array comprises a first system feed network which is connected from a first system radio frequency port to each compound radiation array element, a second system feed network which is connected from a second system radio frequency port to each compound radiation array element, and an electric declination angle adjusting functional module which is arranged on the first system feed network and/or the second system feed network. The dual-system co-antenna feeder base station antenna can be used for providing mutually independent free electric declination angles for a first system and a second system, so that the coverage of wireless base station network signals can be controlled more flexibly and conveniently, and the planning and optimizing capabilities of mobile communication network coverage in dual-system co-station and co-antenna feeder state are greatly improved.