Embodiments of the present disclosure provide a method and a device for determining a status of a terminal and a terminal. The method includes: transmitting, by a bone-conduction acoustic generator, a detection signal outwards; receiving, by a microphone, a reflection signal of the detection signal reflected by an external object; obtaining a distance between the terminal and the external object according to the detection signal and the reflection signal; and determining the status of the terminal in relative to the external object based on the distance.