The utility model provides a desulfurization chimney of power plant anticorrosive coating monitoring devices and pressure -tight box sensor, the desulfurization chimney of this power plant anticorrosive coating monitoring devices include: between pressure -tight box sensor, data collection station, data transmission path, acceptor of data and power plant's desulfurization control, pressure -tight box sensor settings is at the chimney inner wall, through sensor cable junction data collection station, data collection station is connected to acceptor of data through data transmission path, and acceptor of data is connected to between power plant's desulfurization control, the pressure -tight box sensor includes: pressure -tight box and the sensor of setting in the pressure -tight box, be equipped with the opening on the pressure -tight box, multilayer metal mesh screen, the last chimney anticorrosive coating that scribbles of metal mesh screen are installed to the opening part, the sensor is through setting up the circuit board and sensor cable junction in the pressure -tight box. Utilize the utility model discloses, can the acquisition sensor data, provide research data for the analysis of chimney anticorrosive coating.