Disclosed is a blood oxygen measuring device comprising: a light-emitting component arranged on one side of an object-for-measurement and used at least for emitting a first wavelength light and a second wavelength light a light-detecting component arranged on the other side of the object-for-measurement and opposite the light-emitting component, where the light-detecting component comprises a first narrowband light detector and a second narrowband light detector, where the first narrowband light detector is used for receiving transmitting light of the first wavelength light transmitted through the object-for-measurement and for converting into an electric signal corresponding to the first wavelength light, and where the second narrowband light detector is used for receiving transmitting light of the second wavelength light transmitted through the object-for-measurement and for converting into an electric signal corresponding to the second wavelength light and a signal processing circuit respectively coupled to output ends of the first narrowband light detector and of the second narrowband light detector for calculating blood oxygen saturation level. The present invention effectively suppresses interferences from ambient lights, while at the same time provides a possibility in improving the capability of the blood oxygen measuring device in terms of suppressing interferences from movements of the object-for-measurement.La présente invention porte sur un dispositif de mesure doxygène du sang comprenant : un composant démission de lumière agencé sur un côté dun objet pour mesure et utilisé au moins pour émettre une première lumière de longueur donde et une seconde lumière de longueur donde un composant de détection de lumière agencé sur lautre côté de lobjet pour mesure et opposé au composant démission de lumière, le composant de détection de lumière comprenant un premier détecteur de lumière de bande étroite et un second détecteur de lumière de bande étroite, le prem
