The invention discloses an OLED light detecting device. The device comprises a shell body, a light emitting device, a placement unit, a light collection device, a blood pressure calculating device, a heart rate calculating device, an output device and a power module, wherein the placement unit is used for placing body surface skin of the detected person; the light emitting device comprises an OLED light source used for emitting irradiated light with a plurality of different wavelength range; the light collection device collects reflected light generated after the light emitting device irradiate s the body surface skin; the blood pressure calculating device calculates blood pressure value according to reflected light signal, the heart rate calculating device calculates heart rate according to the reflected light signal, the blood pressure value and the heart rate value are output by the output device. The OLED light detecting device has the advantages of wide wavelength range, accurate measurement, low energy consumption, low radiation heat, light mass and simple structure, is convenient to carry, can accurately measure physiological features of blood pressure, heart rate, pulse and the like, and also has the functions of being convenient to carry, self-power, data transmission and the like.