Continuous emission monitoring system (special for formaldehyde detection) is a new type of formaldehyde measuring instrument based on years of experience in UV technology. The system can solve the problems of poisoning, short maintenance period and unstable measurement of electrochemical formaldehyde module. The minimum range is as low as 50ppm. The formaldehyde meter has been successfully applied in many occasions. It is a continuous emission monitoring system based on ultraviolet differential absorption spectroscopy technology for formaldehyde measurement with independent intellectual property rights.