Blood oxygen monitoring device and breathing mask

The invention provides a blood oxygen monitoring device. The blood oxygen monitoring device comprises a blood oxygen monitoring module, wherein the blood oxygen monitoring module comprises a casing, a detection module and a wireless transmission module, the detection module and the wireless transmission module are arranged in the casing; the detection module is connected with the wireless transmission module. According to the technical scheme, the wireless transmission module is arranged in the blood oxygen monitoring module, data are transmitted through the wireless transmission module when the blood oxygen saturation is monitored, the situation that a data line is pulled accidentally when the data line is adopted is avoided, and accordingly, the monitoring result of the blood oxygen saturation is more accurate.