The invention belongs to the field of antennas, and provides a high-gain antipodal Vivaldi antenna. The high-gain antipodal Vivaldi antenna comprises a dielectric substrate, a balance feed Balun, an upper-layer radiation patch and a lower-layer radiation patch, wherein an antenna radiation aperture is further provided with a director, and the director is composed of two composite metal patches which are positioned on the upper and lower surfaces of the dielectric substrates and arranged in a correspondingly overlapped manner; and each composite metal patch is formed by intersecting a small oval metal patch and a large oval metal patch, the small oval metal patch is close to the antenna radiation aperture, and the large oval metal patch is away from the antenna radiation aperture. The high-gain antipodal Vivaldi antenna introduces the director at the antenna radiation aperture on the basis of a traditional antipodal Vivaldi antenna, and replaces exponential curves of internal flanges of the upper-layer radiation patch and the lower-layer radiation patch with composite exponential curves, thereby realizing the purpose of expanding antenna bandwidth and improving antenna gain and directionality.