A multi-band antenna includes a grounding element, a first antenna connected to the grounding element, a second antenna connected to the grounding element and a coupling radiating arm extending from the grounding element. The grounding element extends along a lengthwise direction and includes first and second lengthwise sides. The first antenna includes a first connecting element extending from the grounding element and a first radiating element electrically connected to the first connecting element. The second antenna includes a second connecting element extending from the grounding element and a second radiating element electrically connected to the second connecting element. The first radiating element includes a first radiating portion extending from the first connecting element in both a longitudinal direction and a transverse direction and a second radiating portion substantially being leptosomatic. The second radiating element substantially extends in a lengthwise direction and forms a first radiating section operating on a first frequency band and a second radiating section operating on a second frequency band. The first antenna is located between the first antenna and the second antenna in a vertical direction. The coupling radiating arm is between the first radiating section of the second radiating element of the second antenna and the grounding element in a vertical direction.