The invention discloses a satellite communication dual-frequency circularly polarized antenna, which comprises an inner dielectric support, an inner radiator, an outer dielectric support, an outer radiator, a feeding layer and a grounding layer, wherein the inner dielectric support is of a cylinder structure, and two coaxial cables are arranged in the middle of the inner dielectric support; the inner radiator is of a four-arm spiral structure, and four spiral wires of the inner radiator are evenly wound around the outer surface of the inner dielectric support; the outer dielectric support is of a cylindrical ring structure, the outer dielectric support sleeves the inner dielectric support, and the outer diameter of the outer dielectric support is greater than the outer diameter of the inner dielectric support; and the outer radiator is of a four-arm spiral structure, and four spiral wires of the outer radiator are evenly wound around the outer surface of the outer dielectric support. The satellite communication dual-frequency circularly polarized antenna has the advantages of simple structure, small size, wide antenna bandwidth, high gain, high gain consistency of the two frequencybands, good overall performance and capability of meeting the requirement of miniaturization.