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1. A multi-layer low-profile four-arm spiral antenna, comprising a metal grounding plate, wherein a top surface of the metal grounding plate is fixedly connected with three layers of cylindrical dielectric substrates; the three layers of dielectric substrates are coaxially arranged, and the three layers of dielectric substrates are coaxially arranged with the metal grounding plate, and a gap is set between two adjacent layers of the dielectric substrates; four spiral metal strips with a same rotation direction are respectively arranged on each layer of the dielectric substrate, the four spiral metal strips on each layer of the dielectric substrate form spiral radial arms, and a phase difference of the four spiral metal strips on each layer of the dielectric substrate is 90°; and the corresponding spiral metal strips on the two adjacent layers of the dielectric substrates are connected by connecting bridges, the connecting bridges are arranged in the gap, and axes of the connecting bridges are perpendicular to axes of the dielectric substrates, and the connecting bridges are metal bridges.
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