An antenna device for a mobile terminal, comprising: a plurality of antennas; a metal battery cover comprising a plurality of first ground points; a mainboard comprising a plurality of feed sources and a plurality of second ground points corresponding to the plurality of feed sources, the plurality of feed sources being coupled to the plurality of antennas; and a plurality of first connecting members coupling the plurality of first ground points to the plurality of second ground points of the mainboard; wherein the metal battery cover further comprises a plurality of third ground points, the mainboard further comprises a ground wire, and the antenna device further comprises a plurality of second connecting members coupling the plurality of third ground points to the ground wire of the mainboard; characterized in that, the plurality of third ground points are four third ground points, the metal battery cover comprises four sides, and the four third ground points are located at midpoints of the four sides respectively, and the antenna device further comprises a plurality of first conductive fabrics and a plurality of second conductive fabrics, each of the plurality of first conductive fabrics is located between each first ground point and each corresponding first connecting member; and each of the plurality of second conductive fabrics is located between each third ground point and each corresponding second connecting member, the plurality of second ground points are adjacent to the plurality of the feed sources, and the antenna device further comprises a plurality of first capacitors coupled between the plurality of first connecting members and the plurality of first ground points respectively and a plurality of second capacitors coupled between the plurality of second connecting members and the plurality of third ground points respectively. a plurality of antennas; a metal battery cover comprising a plurality of first ground points; a mainboard comprising a plurality of feed sources and a plurality of second ground points corresponding to the plurality of feed sources, the plurality of feed sources being coupled to the plurality of antennas; and a plurality of first connecting members coupling the plurality of first ground points to the plurality of second ground points of the mainboard; wherein the metal battery cover further comprises a plurality of third ground points, the mainboard further comprises a ground wire, and the antenna device further comprises a plurality of second connecting members coupling the plurality of third ground points to the ground wire of the mainboard; characterized in that, the plurality of third ground points are four third ground points, the metal battery cover comprises four sides, and the four third ground points are located at midpoints of the four sides respectively, and the antenna device further comprises a plurality of first conductive fabrics and a plurality of second conductive fabrics, each of the plurality of first conductive fabrics is located between each first ground point and each corresponding first connecting member; and each of the plurality of second conductive fabrics is located between each third ground point and each corresponding second connecting member, the plurality of second ground points are adjacent to the plurality of the feed sources, and the antenna device further comprises a plurality of first capacitors coupled between the plurality of first connecting members and the plurality of first ground points respectively and a plurality of second capacitors coupled between the plurality of second connecting members and the plurality of third ground points respectively.