The present disclosure discloses an ultra-wideband miniaturized crossed circularly-polarized antenna, comprising a plurality of radiation sheets, a substrate, a reflecting plate and a phase shifting 90-degree equal power divider, all of which are disposed in order. The front side of the substrate faces the radiation sheets and is provided with an excitation slot. The back side of the substrate faces the reflecting plate and is provided with a first power divider and two first transmission lines, as well as a second power divider and two second transmission lines. Input ends of the first power divider and the second power divider are connected to two input ends of the phase shifting 90-degree equal power divider, respectively. The two first transmission lines and the two second transmission lines orthogonally intersect with the excitation slot and are connected to a metal surface of the front side of the substrate, respectively. The ultra-wideband miniaturized crossed circularly-polarized antenna is provided with multiple layers of radiation sheets different in size and corresponding to different frequency bands to achieve the effect of expanding the frequency band. In addition, conversion between crossed circular polarization and linear polarization is realized by means of the phase shifting 90-degree equal power divider.
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