The invention relates to a display electric quantity value calibration method and a device. The display electric quantity value calibration method and the device are used for avoiding the phenomenon that an electric quantity value changes in a non-smooth mode or in a fluctuating mode. The display electric quantity value calibration method and the device include that when in an
electric discharge condition and a acquired
electric discharge detection electric quantity value is larger than a display electric quantity value and smaller than a threshold value, the display electric quantity value is not updated; when the acquired
electric discharge detection electric quantity value is smaller than the display electric quantity value, the display electric quantity value subtracts 1; when the acquired electric
discharge detection electric quantity value is larger than the threshold value, a novel electric
discharge detection period is determined; when in an
electric charge condition and a acquired
electric charge detection electric quantity value is smaller than the display electric quantity value, the display electric quantity value is not updated; when the acquired
electric charge detection electric quantity value is larger than the display electric quantity value, the display electric quantity value adds 1; when in a wake-up condition, and
resting time is larger than first preset time, the display electric quantity is reacquired; when the
resting time is smaller than the first preset time, a novel display electric quantity value is acquired; and when the device is restarted and a difference of starting time and shut-down time is larger than a second preset time, the display electric quantity value is re-determined. The method can avoid the phenomenon that the electric quantity value changes in the non-smooth mode or in the fluctuating mode.