A multi-band antenna is to be electrically connected to a transceiving terminal of a radio frequency circuit by a feeding unit and includes a grounding section, a feed-in section electrically connected to the feeding unit, first and second radiator arms respectively disposed at opposite lateral sides of the feed-in section and electrically connected to the feed-in section, and a first coupling component. The first and second radiator arms are configured to generate first and second resonant modes, respectively. When the multi-band antenna transceives radio frequency signals, the second radiator arm and the first coupling component generate a coupling effect such that the first coupling component generates a third resonant mode. Center frequencies of the first, second, and third resonant modes are different from each other.