The invention discloses a multi-modal orbital angular momentum (OAM) vortex electromagnetic wave microstrip array antenna. The antenna comprises a medium substrate, a plurality of array elements, and coaxial feeders and input ports which are corresponding to the array elements. The array elements employ circularly polarized square corner cut patch antennas with truncated corners, the array elements are circumferentially arranged at one surface of the medium substrate at equal distances, a metal thin layer is attached to the other surface of the medium substrate as a grounding surface, and the input ports are connected with the corresponding array elements through the coaxial feed lines. According to the invention, vortex electromagnetic waves with multiple OAM modes are generated simultaneously at one frequency point, and the multi-modal OAM vortex electromagnetic wave microstrip array antenna is suitable for wireless communications such as currently most popular Wi-Fi, ZigBee, Bluetooth and the like. The vortex electromagnetic waves which are good in performance and have dual features of OAM and circular polarization can be generated, the vortex electromagnetic waves are used for multiplexing, multiple coaxial data flows can be sent in one individual channel, and the frequency spectrum utilization rate and the system capacity can be improved to the maximum degree under the condition that the bandwidth is not increased.