The invention relates to the technical field of antennas, in particular to a flattened luneberg lens antenna, including a first medium, a second medium, a third medium, a fourth medium, a fifth medium, a sixth dielectric, a waveguide feed source, a first printed board and a second printed board, the first medium, the second medium, the third medium, the fourth medium, the fifth medium and the sixth medium are concentrically placed from the inside to the outside to form a cylinder, the waveguide feed source is located at the edge of the cylinder, and the first printed board and the second printed board are respectively bonded to the upper and lower surfaces of the cylinder. While the flattened luneberg lens antenna of the invention realizes beam convergence in the E plane, in the H plane ofthe flattened luneberg lens antenna, due to the effect of a magnet ring of a loaded metal layer, electromagnetic waves are also close to the plane waves at the emergence end of the lens, compared with the case where the metal layer is not loaded, a directional diagram with a narrow beam and a low side lobe can be obtained in the H plane, and the performance is superior.