Multi-frequency antenna

The utility model discloses a multi-frequency antenna, which comprises a grounding part, a connecting part, a feed-in part, a first antenna part, a second antenna part and a feed-in end, wherein the grounding part is provided with a grounding end; the first antenna part is provided with a first radiation vertical bar, a first radiation horizontal bar, a second radiation vertical bar and a second radiation horizontal bar; the connecting part is connected between the grounding part and the first radiation vertical bar of the first antenna part; the second antenna part is adjacent to one side of the grounding part and is provided with a third radiation vertical bar which is adjacent to the first radiation vertical bar; a third radiation horizontal bar extends from one side of the end of the third radiation vertical bar; and the feed-in part is arranged between the first radiation vertical bar and the third radiation vertical bar. The multi-frequency antenna can send and receive electromagnetic wave signals of th