Abstract: An electronic device includes a main body and an anti-theft system positioned in the main body. The anti-theft system includes a control unit, an alert unit, and a sensing unit. The alert unit and the sensing unit are electrically connected to the control unit correspondingly. The sensing unit is arranged on the main body. When the electronic device is at an unlocked state, the alert unit alerts with the sensing unit being touched and the control unit sensing electrical current of human. The sensing unit is formed on the electronic device, and the sensing unit is difficult to be aware of and remove. Therefore, the electronic device has a good anti-theft function.