The embodiment of the invention provides an approaching detection device comprising an antenna body of a mobile terminal, a side
metal strip of the mobile terminal and a
capacitance detection sensor circuit, wherein the antenna body of the mobile terminal and the side
metal strip of the mobile terminal are used for detecting the
capacitance of a space between the antenna body of the mobile terminal and the side
metal strip of the mobile terminal; the
capacitance detection sensor circuit is electrically coupled with the antenna body of the mobile terminal and the side metal strip of the mobile terminal, judges whether a person approaches the device according to the capacitance detected by the antenna body of the mobile terminal and the side metal strip of the mobile terminal, and outputs an instruction
signal to indicate that the person approaches the device when judging that the person approaches the device. In the embodiment of the invention, the antenna body of the mobile terminal and the side metal strip of the mobile terminal are used for detecting the capacitance of the space, the capacitance detection sensor circuit judges whether the person approaches the device according to the capacitance to achieve the approaching detection scheme, therefore, the internal space of the mobile terminal is saved, the difficulty in designing the mobile terminal is reduced, the cost is lowered, and the mobile terminal favorably tends to be small and thin.