A multi-beam Luneburg lens antenna with lobe equalization and operating in the X-band is designed and fabricated by 3D printing technology. The required gradient relative dielectric constant is implemented by changing the dielectric filling rate of each unit of the lens. A set of dual-mode conical horn antennas is used as the feed to generate multiple beams with lobe equalization characteristics. Experiments show that the antenna can generate multiple beams in three-dimensional space, covering the range of ±20° in altitude and azimuth, and the characteristics of each beam stay identical. The maximum gain of the antenna is 24 dBi. The 3 dB beam width is 8°. It has high gain and good focusing characteristics. Because of the antenna’s simple structure, short turn-around fabrication time and low fabrication cost, together with its good operational characteristics, it has good application prospects in the field of radar, detection, and sensing.