Nowadays, rationalization of resources, environmental, the healthy way of production and life have been gradually taken seriously. With the rapid development of the economy, air pollution caused by harmful particles and gases such as dust, exhaust gas and formaldehyde is becoming more and more serious. Higher requirements for monitoring and treatment of pollution sources are put forward. This paper studies an environmental protection circuit device combined with high-precision dust exhaust and formaldehyde detection sensor in one. The volume is very small, the hardware resource occupancy rate is very low, and the anti-interference ability is strong. No matter from anti-interference, speed, online programmable characteristics, or from the perspective of operational reliability, it can achieve the desired results.