The present invention provides an antenna apparatus and a mobile terminal, wherein the antenna apparatus comprises: an antenna assembly connected to a main board through a first feeding point and at least one ground terminal; and an adjusting device connected between the antenna assembly and the main board. The adjusting device includes a plurality of matching devices which are connected in parallel; a switching device in series connection with the plurality of matching devices for selecting at least one of the matching devices to be conductive; and a control device for controlling the switching device. Through the antenna apparatus and the mobile terminal provided by the invention, full coverage can be realized under the condition of the large area of metal coverage of a mobile terminal and small clearance.