Negative ion sensor module is a highly integrated professional air negative ion monitoring module with advantages of stable measurement process and high measurement accuracy. Meanwhile, the built-in dehumidification module can operate normally under high humidity or extreme environment. The monitoring data will be transmitted to the cloud platform of Wanyitechnology Internet of Things through GPRS and other means, the cloud platform can carry out data analysis, data download and other functions, as well as the data to the outdoor display, with RS232 output, can be open data protocol docking. At the same time, there are micro air negative ion sensor electrode, with the advantages of small size, convenient installation, real-time detection, low price, suitable for negative ion generator related products integrated measurement use.