The temperature and humidity of soil are the key parameters affecting the growth and development of crops, soil temperature affects the growth and development of plants and soil.The formation of various biochemical processes in soil, such as the biochemical and inanimate chemical processes caused by microbial activities, is affected by soil temperature.Soil moisture is also a basic condition for crop growth and development and an important parameter for crop yield prediction. Therefore, we should get information on soil temperature and humidity to formulate manual intervention measures.Application is an important guarantee for stable production. In this paper, AT89S52 microcontroller as the main control chip, combined with temperature and humidity sensors and computers, built a set of farmland soil temperature and humidity monitoring hardware platform;LabVIEW, a software development platform of National Instrument Corporation of America, designs and compiles the host computer software based on the state machine program framework, which realizes friendly users.Interactive interface, complete the real-time measurement of soil temperature and humidity, display and record functions, batch data storage and management, using statistics.Data analysis, data query results draw statistical histogram, generate reports. By using the function of the front panel network release, the local area of the real-time monitoring system is realized network remote control. Tests show that the system works reliably, has high measurement accuracy, simple structure, stable operation, easy to debug and expand, and can accurately and accurately measure soil temperature and humidity.