An antenna device comprises a radiator, a first grounding branch and a second grounding branch. The radiator comprises a feeding point, a first radiation section and a second radiation section. The first radiation section and the second radiation section are arranged on two sides of the feeding point, and a first gap and a second gap are arranged between the first radiation section and the feedingpoint and between the second radiation section and the feeding point respectively. One end of the first radiation section, away from the first gap, is provided with a first grounding end, and one endof the second radiation section, away from the second gap, is provided with a second grounding end. The first grounding branch comprises a third grounding end and a first connecting end. The first connecting end is located at an intersection point of the first grounding branch and the first radiation section, and a matching circuit is connected in series between the first connecting end and the first grounding end. The second grounding branch comprises a fourth grounding end and a second connecting end, the second connecting end is located at the intersection point of the second grounding branch and the second radiation section, and a first high-frequency filter is connected in series between the second connecting end and the second grounding end. In the invention, low-frequency double resonance can be realized, and a tuning switch is saved.