The invention discloses a millimeter wave reconstructible antenna and belongs to the technical field of antennas. The antenna herein includes a feed source horn, a first medium layer, a radiation array reflection surface layer, a second medium layer, a ground plate, and a DC offset voltage which connect between the radiation array reflection layer and the ground layer. The first medium layer, the radiation array reflection surface layer, the second medium layer and the ground plate are successively from top to bottom. According to the invention, the antenna uses the fact that a liquid crystal material can exhibit the characteristics of different effective dielectric constant values when at the control of different voltages, and changes the emitting phase positions of wave beams that are radiated to an antenna unit by controlling the voltages of all units, such that the changes of directional diagrams of the wave beams emitted by the antenna are realized. The antenna controls the directions of wave beams through voltages. The antenna is advantaged by simple structure, fast adjustment speed and wide scanning range.