A multi-band antenna (1), comprising a grounding element (10) extending horizontally along a longitudinal direction, comprising a side edge (101) with a connecting point (102) and a grounding point (103) distanced from the connecting point by a length; a radiating element (11) disposed at an upper level parallel to the grounding element and defining a first end and a second end, and operating in a first frequency band; a connecting element (12) located between the radiating element and the grounding element, comprising a first portion (121) connecting to the first end of the radiating element and a second portion (122) linking to said connecting point of the grounding element; a parasitic element (13) extending from the second portion of the connecting element towards the second end of the radiating element along the longitudinal direction, and operating in a second frequency band; a feeding point (141) disposed on the second portion of the connecting element and under the parasitic element; and a feeding line (15) comprising an inner conductor connected to the feeding point and an outer conductor connected to the grounding point; wherein said connecting element, the grounding element, the feeding point and the grounding point together forming a slot (16) operating in a third frequency band.