A multi-band antenna, comprising - a feeder ; and - a radiating element connected to the feeder ; - a first tuning device ; - a notch structure being a grounded stub and comprising a first notch structure , wherein the first notch structure is located on a side of the radiating element and connected to the radiating element in a coupling manner; and a second notch structure , wherein the second notch structure is located on a side that is of the first notch structure and that is far from the radiating element , and an end that is of the second notch structure and that is far from the radiating element is grounded; wherein - the first notch structure is selectively connectable to the ground and to the second notch structure , respectively, by the first tuning device ; - the first tuning device comprises a plurality of first parallel-connected branches and a first selection switch , and the plurality of first parallel-connected branches are same or different branches; wherein the first selection switch is configured to select one of the plurality of first parallel-connected branches to connect the first notch structure to the second notch structure ; and - the first tuning device further comprises a plurality of second parallel-connected branches that are connected to the ground, and the plurality of second parallel-connected branches are same or different branches, wherein the first selection switch is configured to select one of the plurality of third parallel-connected branches to connect the first notch structure to ground. - a feeder ; and - a radiating element connected to the feeder ; - a first tuning device ; - a notch structure being a grounded stub and comprising a first notch structure , wherein the first notch structure is located on a side of the radiating element and connected to the radiating element in a coupling manner; and a second notch structure , wherein the second notch structure is located on a side that is of the first notch structure and that is far from the radiating element , and an end that is of the second notch structure and that is far from the radiating element is grounded; wherein a first notch structure , wherein the first notch structure is located on a side of the radiating element and connected to the radiating element in a coupling manner; and a second notch structure , wherein the second notch structure is located on a side that is of the first notch structure and that is far from the radiating element , and an end that is of the second notch structure and that is far from the radiating element is grounded; wherein - the first notch structure is selectively connectable to the ground and to the second notch structure , respectively, by the first tuning device ; - the first tuning device comprises a plurality of first parallel-connected branches and a first selection switch , and the plurality of first parallel-connected branches are same or different branches; wherein the first selection switch is configured to select one of the plurality of first parallel-connected branches to connect the first notch structure to the second notch structure ; and - the first tuning device further comprises a plurality of second parallel-connected branches that are connected to the ground, and the plurality of second parallel-connected branches are same or different branches, wherein the first selection switch is configured to select one of the plurality of third parallel-connected branches to connect the first notch structure to ground. <EOS>