This application provides a blood oxygen detection method with multiple photoelectric detectors connected in parallel. The method includes: An electronic device determines, based on a plurality of pieces of detection data, a category of a scenario in which the electronic device currently performs blood oxygen detection, where the detection data is used for describing whether detection currents output by corresponding photoelectric detectors are abnormal, or the detection data is used for describing a current wearing state of the electronic device; and determines, based on the scenario category, to perform calculation based on a detection current output by at least one of the multiple PDs to obtain oxygen saturation.