Abstract: This paper takes the data transmission process of farmland irrigation system as the research object, and constructs the data interaction system of irrigation system based on wireless network communication transmission. The temperature and humidity sensor is used to monitor the soil humidity in the farmland area, and the monitoring data is sent to the upper computer through the communication network. After comparing with the set threshold, the irrigation control command is generated. The system operation test data show that the system operation process is stable and efficient, the data transmission is safe, and has high practicability in the process of farmland irrigation.