The present invention discloses an ultra-wideband cross-polarized antenna and ultra-wideband cross-polarized array antenna, including a substrate, and a first polarized antenna and a second polarized antenna provided in the substrate and orthogonal to each other. The ultra-wideband cross-polarized antenna has a simple structure, is easy to produce and is able to solve challenging bandwidth issues, cross-polarized port isolation issues, and beam scanning range issues in 5G millimeter wave array antennas.