The invention discloses a self-stick, a self-stick identification method and apparatus, and a mobile terminal. The method comprises the steps of when a headphone plug of an external device is inserted into a headphone jack of the mobile terminal, acquiring a first voltage of a left sound channel port of the headphone plug and a second voltage of a right sound channel port of the headphone plug; and determining whether the external device is the self-stick according to the first voltage and the second voltage. In the self-stick identification method, after the headphone plug of the external device is inserted into the headphone jack of the mobile terminal, the mobile terminal acquires the first voltage of the left sound channel port and the second voltage of the right sound channel port of the headphone jack, and determines whether the external device is the self-stick according to the intensity of the first voltage and the second voltage, so that the mobile terminal is switched to a shoot mode when the self-stick is connected. Through adoption of the method, the mobile terminal can automatically identify the self-stick and automatically starts the shoot mode after identifying the self-stick, so that the user operation is simplified, and the user experience is improved.