The present disclosure relates to a PPG signal collection method and apparatus. The method includes: collecting, by using a light sensor, a first PPG detection signal formed by a first light source, where the first light source is a green light source； collecting, by using the light sensor, a second PPG detection signal formed by a second light source, where the second light source is a red light source； further, determining, according to the first PPG detection signal, whether the first light source meets a preset collection indicator； if the first light source meets the collection indicator, determining, according to the second PPG detection signal, whether the second light source meets the collection indicator； and if the second light source meets the collection indicator, collecting, by using the light sensor, a PPG signal formed by the second light source.
