The invention discloses a polar component selectable ultra wide band antenna array based on a crisscross structure. The array comprises a plurality of Vivaldi antenna units arranged in rectangular grids, wherein each antenna unit is limited within a specific rectangle range and aslant placed relative to a horizontal plane, and the adjacent antenna units have the characteristic of periodical arrangement. Each antenna unit is surrounded by four crisscross metal components, and the units along inclined directions are mutually electrically connected via the crisscross support connection metal components. Lengths of four branches of the crisscross metal component affect effective radiation current on the antenna unit, when the length of the branch along the horizontal plane is prolonged, the current component along the horizontal direction on the antenna unit is reduced, an vice versa, so that the components along the perpendicular and horizontal directions of the far zone radiation electric field can be adjusted through adjusting the lengths of the four branches. The antenna array provided by the invention has the characteristics of wide band and wide angle, is simple in structure an easy to process, and has important actual engineering application value.