A mobile communication antenna device, comprising: a monopole antenna, placed on one side of a printed circuit board, wherein a distance between the monopole antenna and a central position of the printed circuit board is less than a threshold, and the monopole antenna comprises: a first metal sheet, vertical to the printed circuit board, and conducted with a circuit of the printed circuit board through a feedpoint, and characterized in that the monopole antenna further comprises: a second metal sheet, placed between the printed circuit board and the first metal sheet, and vertical to the printed circuit board, wherein one side that is parallel with and close to the printed circuit board is conducted with a ground point of the printed circuit board, and one side that is parallel with and away from the printed circuit board is hanged in the air, and wherein the one side that is of the second metal sheet and is vertical to the printed circuit board is placed in a folded manner or disposed to form multiple serpentine grooves. a monopole antenna, placed on one side of a printed circuit board, wherein a distance between the monopole antenna and a central position of the printed circuit board is less than a threshold, and the monopole antenna comprises: a first metal sheet, vertical to the printed circuit board, and conducted with a circuit of the printed circuit board through a feedpoint, and characterized in that the monopole antenna further comprises: a second metal sheet, placed between the printed circuit board and the first metal sheet, and vertical to the printed circuit board, wherein one side that is parallel with and close to the printed circuit board is conducted with a ground point of the printed circuit board, and one side that is parallel with and away from the printed circuit board is hanged in the air, and wherein the one side that is of the second metal sheet and is vertical to the printed circuit board is placed in a folded manner or disposed to form multiple serpentine grooves. a first metal sheet, vertical to the printed circuit board, and conducted with a circuit of the printed circuit board through a feedpoint, and characterized in that the monopole antenna further comprises: a second metal sheet, placed between the printed circuit board and the first metal sheet, and vertical to the printed circuit board, wherein one side that is parallel with and close to the printed circuit board is conducted with a ground point of the printed circuit board, and one side that is parallel with and away from the printed circuit board is hanged in the air, and wherein the one side that is of the second metal sheet and is vertical to the printed circuit board is placed in a folded manner or disposed to form multiple serpentine grooves. a second metal sheet, placed between the printed circuit board and the first metal sheet, and vertical to the printed circuit board, wherein one side that is parallel with and close to the printed circuit board is conducted with a ground point of the printed circuit board, and one side that is parallel with and away from the printed circuit board is hanged in the air, and wherein the one side that is of the second metal sheet and is vertical to the printed circuit board is placed in a folded manner or disposed to form multiple serpentine grooves.