Embodiments of the invention disclose a self-stick, a self-stick identification method and apparatus, and a mobile terminal. The self-stick identification method comprises the steps of when it is detected that a headphone plug of an external device is inserted into a headphone jack of the mobile terminal, sending a characteristic audio signal to a first sound channel terminal in the external device; collecting the audio signal by using an MIC terminal in the external device; and identifying whether the external device is the self-stick according to the collected audio signal, wherein the first sound channel terminal and a second sound channel terminal of the self-stick are connected with each other via a signal processor, and the second sound channel terminal is connected with the MIC terminal. According to the self-stick identification method, the collected audio signal can help identify the fact that the external device is the self-stick or the headphone, so that the self-stick can be identified automatically.