Agricultural modernization has gradually become the direction of future agricultural development. With the improvement of the technical capacity of the Internet of things, a new agricultural development model, namely, intelligent agriculture, has gradually emerged. It can not only improve the production efficiency of agriculture but also improve the efficiency of resource utilization. The main work of the software design of the terminal node is the IoT network connection, the sensor work acquisition, and the packaging of the collected data for transmission and acceptance control to fundamentally alleviate the pressure on food security and ensure the sustainable development of China's agriculture. The experiment demonstrates that the curve temperature cycle of the agricultural greenhouse monitored by the system in this paper is normal, and the maximum temperature has been constant under different time cycles. For example, the maximum values of 5, 15, and 20 are all 0.67.