The application discloses a photoelectric sensor, a fabricating method thereof, and a display device. The method for fabricating the photoelectric sensor, includes: fabricating a thin film transistor (TFT) array and a photodiode array on a silicon substrate; transferring the TFT array onto a base substrate by a micro transfer process; and placing the photodiode array on the base substrate formed with the TFT array, in a manner that an orthographic projection of the photodiode array on the base substrate overlaps with an orthographic projection of the TFT array on the base substrate.