An antenna apparatus, comprising: a feeding point and a first antenna radiator; and a tuning circuit, wherein a first end of the tuning circuit is connected to the feeding point, and a second end of the tuning circuit is connected to one end of the first antenna radiator; and the tuning circuit comprises: N tuning components, wherein each tuning component comprises: a plurality of pins, wherein the plurality of pins comprise a first pin, a second pin, a third pin, and a fourth pin; a reactance element, wherein the reactance element is connected between the first pin and the second pin; a switch assembly, disposed between the third pin and the fourth pin; a first internal branch, wherein one end of the first internal branch is connected to the third pin; and a second internal branch, wherein one end of the second internal branch is connected to the fourth pin, wherein the other end of the first internal branch is connected to the other end of the second internal branch to form an integrated end, and the integrated end is connected to the first pin; and a signal controller, wherein the signal controller is configured to control the switch assembly to switch between an on state and an off state of the first internal branch, and/or the signal controller is configured to control the switch assembly to switch between an on state and an off state of the second internal branch; and at least two of the first pin, the second pin, the third pin, and the fourth pin of each of the N tuning components are connected between the first end of the tuning circuit and the second end of the tuning circuit, wherein N is a positive integer greater than 1. a feeding point and a first antenna radiator; and a tuning circuit, wherein a first end of the tuning circuit is connected to the feeding point, and a second end of the tuning circuit is connected to one end of the first antenna radiator; and the tuning circuit comprises: N tuning components, wherein each tuning component comprises: a plurality of pins, wherein the plurality of pins comprise a first pin, a second pin, a third pin, and a fourth pin; a reactance element, wherein the reactance element is connected between the first pin and the second pin; a switch assembly, disposed between the third pin and the fourth pin; a first internal branch, wherein one end of the first internal branch is connected to the third pin; and a second internal branch, wherein one end of the second internal branch is connected to the fourth pin, wherein the other end of the first internal branch is connected to the other end of the second internal branch to form an integrated end, and the integrated end is connected to the first pin; and a signal controller, wherein the signal controller is configured to control the switch assembly to switch between an on state and an off state of the first internal branch, and/or the signal controller is configured to control the switch assembly to switch between an on state and an off state of the second internal branch; and at least two of the first pin, the second pin, the third pin, and the fourth pin of each of the N tuning components are connected between the first end of the tuning circuit and the second end of the tuning circuit, wherein N is a positive integer greater than 1. a plurality of pins, wherein the plurality of pins comprise a first pin, a second pin, a third pin, and a fourth pin; a reactance element, wherein the reactance element is connected between the first pin and the second pin; a switch assembly, disposed between the third pin and the fourth pin; a first internal branch, wherein one end of the first internal branch is connected to the third pin; and a second internal branch, wherein one end of the second internal branch is connected to the fourth pin, wherein the other end of the first internal branch is connected to the other end of the second internal branch to form an integrated end, and the integrated end is connected to the first pin; and a signal controller, wherein the signal controller is configured to control the switch assembly to switch between an on state and an off state of the first internal branch, and/or the signal controller is configured to control the switch assembly to switch between an on state and an off state of the second internal branch; and at least two of the first pin, the second pin, the third pin, and the fourth pin of each of the N tuning components are connected between the first end of the tuning circuit and the second end of the tuning circuit, wherein N is a positive integer greater than 1.