The invention relates to a low profile compact vertical polarization antenna with a reconfigurable directional pattern, and belongs to the field of antenna design. The antenna comprises an upper dielectric substrate, a lower dielectric substrate, three identical top loaded folded monopoles, a feed structure, a coaxial cable and a metal floor. According to the invention, top loaded patches are rationally designed into the shape of a fan, so that the patches can be integrated on the same dielectric substrate to reduce the antenna size; then a curved groove is etched on each fan-shaped patch to further reduce the size of a monopole unit; and finally, three PIN switching diodes are skillfully utilized, so that the monopoles are alternately used as excitation oscillators and parasitic oscillators, and the directional pattern of the antenna can be reconstructed. The alternate working mode greatly reduces the antenna size. According to the invention, the designed vertical polarization antennahas three reconfigurable directional pattern modes, can realize 360-degree scanning in the horizontal direction, and has the advantages of low profile and compact structure.