Multi-frequency antenna

The utility model discloses a multi-frequency antenna, comprising a grounding part; the feed-in part is provided with a first side edge, a second side edge, a first end edge and a second end edge, the first side edge is close to the grounding part, and a distance is kept between the first side edge and the grounding part; the feed-in point is arranged on the feed-in part and is close to the first side edge; the first end edge extends to form the lower grounding part, the lower grounding part is connected between the feed-in part and the grounding part, and the second end edge sequentially extends to form a first extension part, a second extension part, a third extension part, a fourth extension part, a fifth extension part, a first branch part, a second branch part, a third branch part and an annular part. The tail end of the third branch part is connected to the first side edge, the annular part, the first branch part and the second branch part extend to the same side of the feed-in part, and the third branc