Provided are a blood oxygen saturation measurement confidence calculation method, system, and storage medium, said method comprising: recording light intensity information by means of photoplethysmography, the light intensity information comprising red light and infrared light transmission intensity, and infrared light reflection intensity； establishing a linear regression model of a pulse blood oxygen signal characteristic value according to the light intensity information； calculating the confidence of a linear regression line in the linear regression model； according to the confidence of the linear regression line, obtaining the confidence level of the blood oxygen saturation measurement result. The light intensity information obtained by means of photoplethysmography is used for constructing a linear regression model； finally, the confidence of the blood oxygen saturation measurement result is obtained by means of a linear regression model, thereby achieving the reliability evaluation of the measured value, avoiding missed and false detections caused by interference factors such as motion pseudo-error and noise, and improving the reliability of blood oxygen saturation measurement results； the invention is more scientific and can be widely used in the field of signal processing technology.L'invention concerne un procédé de calcul de la confiance dans la mesure de la saturation en oxygène du sang, un système et un support de stockage, ledit procédé comprenant les étapes suivantes : enregistrement d'informations d'intensité lumineuse au moyen de la photopléthysmographie, les informations d'intensité lumineuse comprenant l'intensité de transmission de la lumière rouge et de la lumière infrarouge, et l'intensité de réflexion de la lumière infrarouge ； établissement d'un modèle de régression linéaire d'une valeur caractéristique du signal pulsé d'oxygène du sang conformément aux informations d'intensité lumineuse ； calcul de la confiance d'une ligne de régression liné
