Farmland soil and environment have an important impact on the growth of crops, and the yield and quality of crops are the results of the comprehensive impact of farmland ecological environment at all stages. Therefore, effective monitoring of farmland soil and environment plays an important role in ensuring crop yield, improving quality and guiding production. Soil moisture transmitter measures the dielectric constant inserted into the soil by measuring the change of capacitance on the sensor at a frequency of 100MHz, because the dielectric constant of water is very high to 80, and soil is 3~10. Therefore, when the moisture content in the soil changes, the dielectric constant of the soil also changes considerably. The dielectric properties of soil moisture transmitters enable fast non-destructive measurement of soil moisture. The soil moisture transmitter can output 4~20mA current signal, 0~1VDC, 0~2.5VDC voltage signal and RS485 digital signal. Meet the data transmission with the smart agriculture monitoring system. Soil moisture transmitters are highly reliable, wide temperature operating range and high protection designed to meet outdoor environmental requirements. Through the automatic collection, display and storage of soil temperature, soil moisture, soil salinity, ambient temperature, humidity, light, rainfall, wind speed, wind direction and other spatial information, the smart agriculture monitoring system realizes scientific adjustment of the irrigation canal network according to the soil permeability rate and environmental and climate conditions of each region and plot, and achieves the goal of water saving and energy saving. It can also adjust the types of crops according to the characteristics of the land, improve the yield and quality, and ultimately achieve the purpose of increasing income; At the same time, desertification and salinization of arable land can be avoided.