An electronic device, comprising: an antenna resonance arm; a feeding branch; a grounding branch; a short grounding branch; an antenna feeding point; an antenna ground; and a controlled switch; a first connection portion, a second connection portion and a third connection portion are disposed on the antenna resonance arm, the first connection portion is disposed on a first end portion of the antenna resonance arm, the second connection portion is disposed between the first end portion and a second end portion of the antenna resonance arm, the third connection portion is between the first connection portion and the second connection portion; the antenna feeding point is disposed on the feeding branch; the grounding branch is disposed between the first connection portion and the antenna ground; and the short grounding branch is disposed between the third connection portion and the antenna ground; characterized in that the electronic device is provided with a segmented metal frame, the antenna resonance arm is a part of the metal frame; the feeding branch is disposed between the second connection portion and the antenna ground; the electronic device further comprises a variable capacitor; the variable capacitor is disposed on the feeding branch, the variable capacitor is disposed between the antenna feeding point and the second connection portion; the controlled switch is disposed on the short grounding branch; wherein the electronic device further comprises a control circuit, configured to adjust a capacitance of the variable capacitor and to control the controlled switch to be switched off or switched on, wherein when the controlled switch is switched off, a low-frequency signal is able to be sent or received between the first connection portion and the second connection portion on the antenna resonance arm, and a high-frequency signal is able to be sent or received between the second connection portion and the second end portion of the antenna resonance arm. an antenna resonance arm; a feeding branch; a grounding branch; a short grounding branch; an antenna feeding point; an antenna ground; and a controlled switch; a first connection portion, a second connection portion and a third connection portion are disposed on the antenna resonance arm, the first connection portion is disposed on a first end portion of the antenna resonance arm, the second connection portion is disposed between the first end portion and a second end portion of the antenna resonance arm, the third connection portion is between the first connection portion and the second connection portion; the antenna feeding point is disposed on the feeding branch; the grounding branch is disposed between the first connection portion and the antenna ground; and the short grounding branch is disposed between the third connection portion and the antenna ground; characterized in that the electronic device is provided with a segmented metal frame, the antenna resonance arm is a part of the metal frame; the feeding branch is disposed between the second connection portion and the antenna ground; the electronic device further comprises a variable capacitor; the variable capacitor is disposed on the feeding branch, the variable capacitor is disposed between the antenna feeding point and the second connection portion; the controlled switch is disposed on the short grounding branch; wherein the electronic device further comprises a control circuit, configured to adjust a capacitance of the variable capacitor and to control the controlled switch to be switched off or switched on, wherein when the controlled switch is switched off, a low-frequency signal is able to be sent or received between the first connection portion and the second connection portion on the antenna resonance arm, and a high-frequency signal is able to be sent or received between the second connection portion and the second end portion of the antenna resonance arm.