The invention relates to a dual-polarized antenna. The dual-polarized antenna comprises a reflecting plate, oscillators and a base, four pairs of oscillators are arranged in an adjacent manner in pairs to form dual-polarized units orthogonal to each other, each pair of oscillators include balun arms, a feeding arm, transmission arms and radiating arms, the transmission arms are located between the feeding arm and the radiating arms, the radiating arms comprise radiating arms a, radiating arms b and radiating arms c, the radiating arms a are arranged at the top ends of the transmission arms, the radiating arms b are located at the bottom ends of the radiating arms a, the radiating arms a and the radiating arms b of the four pairs of oscillators are projected in the square shape on the reflecting plate, the radiating arms c are located on the radiating arms b, and the radiating arms c extend along the vertical direction of the radiating arms b. An antenna array comprises the dual-polarized antennas as low-frequency units, the antenna array also comprises high-frequency units and a reflecting plate, and the low-frequency units and the high-frequency unit are vertically arranged on the reflecting plate at intervals. By employing the new antenna structure, the frequency band is wide, the size is small, and the high-frequency influence is small.