A broadband two-dimensional scanning triangular grid multi-polarization transmission array has been designed, with the array antenna adopting a dual-polarized all-metal Vivaldi structure. The miniaturization of the metal Vivaldi antenna can meet the array conditions of the triangular grid. Based on the theory of polarization formation, the characteristics of its multi-polarization formation are studied to adapt to more diversified applications. The prototype measurement results indicate that the antenna array can achieve high-power multi-polarization formation within the X and Ku frequency bands (operating bandwidth ratio of 3:1); with an active Voltage Standing Wave Ratio (VSWR) less than 3, the azimuth and elevation scanning angles can reach ±30°; the equivalent radiated power (within ±30° scanning angle) can reach 110 kW; the array profile is 17 mm.