The utility model provides a light emitting diode's optical detection device, includes: a plummer is used for bearing a light emitting area of treating the light emitting diode of detection, one receives the light ware, contains one and receives light end and light -emitting end, and this receipts light end is this plummer setting of orientation, and a wavelength interface element, locate between this light emitting area of waiting to detect light emitting diode holds with the light -emitting of this receipts light ware.