The invention discloses a planar two-dimensional large-angle scanning antenna array, and relates to the technical field of antennas. The array antenna comprises a first array and a second array, wherein the first array comprises N complementary dipole antennas, the second array comprises M complementary dipole antennas, each complementary dipole antenna comprises a dielectric substrate, a first microstrip patch, a second microstrip patch, a floor, a coaxial feeder and P short-circuit metal posts, the first microstrip patch is arranged on an upper surface of the dielectric substrate, a half opening groove is formed in the first microstrip patch, the second microstrip patch is arranged on an upper surface of the dielectric substrate, the second microstrip patch is perpendicular to the firstmicrostrip patch, the floor is arranged at the bottom of the dielectric substrate, and the coaxial feeder is arranged in the dielectric substrate in a penetrating way. The technical effects of simplestructure, simple arraying mode, low side lobe level during the scanning process and small gain fluctuation are achieved.