The present invention discloses a wideband circularly polarized antenna based on a V-shaped slit. The wideband circularly polarized antenna includes a dielectric substrate, a Z-type microstrip feed line is printed on the backside of the dielectric substrate, the Z-type microstrip feeder is connected to a stub, and the front surface of the dielectric substrate is provided with a radiation patch. An open slit and a closed slit are etched in the radiation patch. The open slit and the closed slit are both V-shaped right-angle slits and are symmetrical with respect to the vertical center line of the radiation patch. The wideband circularly polarized antenna has the advantages of simple structure, small size and wide circular polarization and is easy to adjust.