The invention relates to a multi-
frequency band array antenna which comprises a
metal baffle board, low-frequency radiating elements and high-frequency radiating elements, wherein the low-frequency radiating elements and the high-frequency radiating elements are mounted on the
metal baffle board, the low-frequency radiating elements operate at a
low frequency band, and the high-frequency radiating elements operate at a
high frequency band; the low-frequency radiating elements and the high-frequency radiating elements are arranged on the
metal baffle board in a nested mode, and the
orthographic projection of the low-frequency radiating elements does not coincide with that of the high-frequency radiating elements. Each low-frequency
radiating element is composed of a horizontal oscillator and a pair of vertical oscillators connected with a
feed network. The low-frequency radiating elements are flexible in structure, and the distance and other parameters can be configured flexibly according to actual application requirements. By the adoption of the structure of the multi-
frequency band array antenna, the stability of
radiation characteristics of the multi-
frequency band array antenna within the range of an ultra-
wide band can be maintained, and the multi-frequency band array antenna is compatible with multiple systems in mobile communication including 2G, 3G and 4G LTE; the number of antennae for a
base station and
station distribution cost can be reduced, and operation and maintenance cost also can be reduced.