The invention discloses an earphone, a terminal and a terminal control method. The earphone comprises an earphone body and a first data transmission unit, wherein the earphone body comprises at least one receiver unit, and a heart rate detection unit arranged on the receiver unit, the heart rate detection unit is used for detecting heart rate data of an earphone wearer, the first data transmission unit is used for carrying out data transmission among the receiver unit, the heart rate detection unit and the external terminal, audios are played through the receiver unit, the heart rate detection unit is used for detecting the heart rate data of the earphone wearer, a control signal is generated through the earphone or the terminal according to the heart rate data acquired by the heart rate detection unit to carry out control processing on the terminal, when a user is in a sleeping state, an audio player is closed or temporarily stops in an intelligent mode, the user need not close audio playing manually during sleeping, sleeping quality of the user can not be influenced, the earphone is safe and healthy, and improvement of user experience is facilitated.