Based on the Γ-shape feeding structure of magnetoelectric dipole antenna, a thin and light-weight dual-polarized ultra-wideband (UWB) crossed dipole antenna with unidirectional radiation is presented. The dual-polarization is obtained by placing two Γ-shape feeding structures and two pairs of ring dipoles orthogonally. The Γ-shape feeding structure guides the electromagnetic energy in the coaxial line to the electric dipole at the λ/4 wavelength above the metal reflection plate; as a result, a unidirectional radiation is realized. The processing and testing results show that the relative impedance bandwidth of the proposed antenna is up to 83.9% (from 1.35 GHz to 3.30 GHz), and has stable unidirectional radiation is realized within the bandwidth, and its axial gain varies form 7.9 dBi to 8.6 dBi. The test and simulation results are in good agreement, which proves the effectiveness of the design.