Abstract: With the requirements of ultra-wideband and multi-polarization for the multifunctional integrated phased array system, a broadband dual-polarized Vivaldi array antenna based on triangular lattice arrangement is proposed. Different from conventional dual-polarized Vivaldi array antennas, the proposed array with a triangular lattice offers a 15% reduction in the number of array elements and corresponding transceiving active channels, thereby reducing the cost and weight of the antenna system. In this paper, the dual-polarized Vivaldi antenna adopts a planar coupled feeding structure to reduce the profile height. Different from conventional Vivaldi antenna, a combination of metallic structure and PCB structure is employed to ensure good heat dissipation and high power capacity, while reducing the antenna weight and enhancing robustness. The methods of substrate grooving, ground cavity etching, and shorting pins are utilized to suppress in-band resonance points. Eventually, only the metallic radiator, ground, and two dielectric feed layers are required to achieve 3 GHz~11 GHz dual-polarized ultra-wideband impedance matching, with the standing wave below 3 within the ±30° conical scanning range.