Abstract: The present invention relates to a contactless intelligent monitor, including: a light source, a coupler, a concave-convex noise reduction unit, a first photodetector, a second photodetector, an MCU and a terminal; the light source, coupler and concave-convex noise reduction unit are connected in sequence; the output of the concave-convex noise reduction unit is connected to the MCU through the first photodetector and the second photodetector respectively; the MCU is connected to the terminal through a communication module. The present invention can effectively reduce the interference and false alarm caused by noises in the measurement process.