A multi-band antenna is adapted for disposing on a substrate with a ground plane and a matching circuit disposed thereon, and includes a feed-in section, a coupling section, a grounding section, a multiple-bend arm, and a conductor section. The feed-in section is connected electrically to the matching circuit. The coupling section is connected electrically to the feed-in section and is disposed spacedly from the ground plane. The grounding section is connected electrically to the ground plane. The multiple-bend arm is connected electrically to the coupling section and the grounding section and cooperates with the grounding section to form a signal path for signals in a first frequency band. The conductor section is connected electrically to the multiple-bend arm and cooperates with a portion of the multiple-bend arm to form a signal path for signals in a second frequency band.