Human blood oxygen saturation is one of the important data for monitoring the health status. Nowadays it is usually used a cable way to collect the blood oxygen saturation and it limits the communication distance and mobile ability. The common wireless way to collect the blood oxygen saturation has the problems of inaccurate data and the high power consumption. Continuous low-power wireless monitoring system is studied and designed to solve the problems. It enhances the accuracy of the equipment,heightens anti-interference ability and adaptive ability,reduces the system power consumption at the same time.