At present, ZigBee, WiFi, and other communication technologies are widely used in the realization of communication architecture of smart agriculture system. Although these can basically achieve long-distance transmission, low-power consumption, and other requirements, there are still many shortcomings in such aspects as anti-interference and cost. To solve these problems, this study introduces a smart agriculture system based on LoRaWAN technology. The LoRa terminal node is designed by using STM32 MCU as the main controller and LoRa RF module as the data transceiver module, and the raspberry pi is used to build a LoRa gateway concentrator for data forwarding, we finally realize the monitoring of environmental of crop growth and the portable system management function by setting up the ChirpStack service and Flask Web application on the cloud server. The working principle and system design of the LoRaWAN application system are described in detail. The system has stable data transmission and strong anti-interference, also dramatically reduces development costs.