Disclosed in the present invention is a high-isolation dual-polarization broadband antenna, comprising: a hollow metal sheet which is attached at an upper surface of a dielectric plate, and an L-shaped metal microstrip line and an axe-shaped monopole structure which are attached at a lower surface of the dielectric plate, a stepped hollow slit being etched on the hollow metal sheet; a horizontal portion of the L-shaped metal microstrip line is parallel to a long edge of the lower surface of the dielectric plate, while a vertical portion of the L-shaped metal microstrip line is perpendicular to the long edge of the lower surface of the dielectric plate; the axe-shaped monopole structure comprises a strip-shaped vertical portion and an axe-shaped horizontal portion; the hollow metal sheet is electrically connected to a grounded end of a first SubMiniature version A (SMA) head, and the L-shaped metal microstrip line is electrically connected to a feeding end of the first SMA head; the axe-shaped monopole structure is electrically connected to a feeding end of a second SMA head, and the hollow metal sheet is electrically connected to a grounded end of the second SMA head. The high-isolation dual-polarization broadband antenna of the present invention achieves dual polarization by using an orthogonal electric field mode of stepped hollow slit resonance such that two feed ports may be independently tuned.
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