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A wideband dual circularly polarized microstrip antenna has been proposed to support massive data transmission and broadband wireless communication system requirements. Using microstrip antenna as the basic radiation unit, the gain value is increased based on the stacked parasitic patch method and the loaded air cavity method. The antenna unit is fed with a capacitor loaded three-way branch directional coupler to further widen the antenna bandwidth and achieve dual circularly polarized radiation characteristics. The simulation results of unit electrical performance are good, with an impedance to axis ratio relative bandwidth of 27.9% and a peak gain of 5.6 dBi. Based on the radiation unit, a 4 × 4 array combination is designed, with an impedance bandwidth covering 7.2~9.4 GHz. The isolation degree between different polarizations and ports of the same unit is ≥ 15 dB, and the axial ratio is ≤ 3 dB within the passband. The simulation and testing results of the directional pattern are in good agreement, verifying the correctness of the design scheme.