The invention discloses a circularly polarized microstrip antenna, and mainly solves the problems that an existing satellite high speed communication antenna is narrow in frequency band, low in gain, and large in size. The circularly polarized microstrip antenna comprises a radiating unit (1), a dielectric lens (2), a support pillar (3), a parasitic patch layer (4), a patch layer (5), a floor layer (6) and a feed network layer (7). The radiating unit (1) is formed by the parasitic patch layer (4) and the patch layer (5), the floor layer (6) and the feed network layer (7) are adhered on the lower portion of the patch layer (5) in sequence, an orthometric double-fed feed unit is arranged at the back face of the feed network layer (7), and the feed unit extends to the right edge of the feed network layer (7)through feeder lines, and is welded with a sub-miniature-A (SMA) coaxial interface to carry out feed. The dielectric lens (2) is fixed above the parasitic patch layer (4) through the support pillar (3). The circularly polarized microstrip antenna has the advantages of being high in gain, wide in frequency band, small in structure, and capable of being used in various mobile communication base stations.