The invention relates to a dual-frequency antenna. The dual-frequency antenna comprises an upper microstrip antenna, a lower microstrip antenna, a reflector plate and two phase shifting feed networks, wherein the upper microstrip antenna and the lower microstrip antenna are fixed to the front surface of the reflector plate by bolts after being overlapped; the phase shifting feed networks are positioned on the back surface of the reflector plate; and both the upper microstrip antenna and the lower microstrip antenna feed through a dual-fed pin. The dual-frequency antenna not only is easy to realize, but also has a small volume, a good axial ratio bandwidth and a low elevation gain.