The invention relates to a bicircular polarized broad-band antenna radiating element used for a large-angle scanning phased array, which comprises a waveguide shell, a left-handed circular polarized input port, a right-handed circular polarized input port, a circular polarized membrane, packing media, a choke groove and an impedance matching dielectric layer, wherein the left-handed circular polarized input port and the right-handed circular polarized input port are symmetrical structures; the circular polarized membrane is arranged on the axle wire of the waveguide shell; after a linearly polarized signal input by the left-handed circular polarized input port or the right-handed circular polarized input port is converted into a circular polarized signal by the circular polarized membraneand after impedance matching is carried out on the circular polarized signal by the choke groove and the impedance matching dielectric layer, left-handed or right-handed circular polarized electromagnetic waves are externally radiated. The thickness of the impedance matching dielectric layer, the thickness and the radius of the choke groove and the distance between the choke groove and the impedance matching dielectric layer are optimized by electromagnetic simulation, and thereby, scanning dead zones can not be generated definitely under the condition of large-angle scanning.