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In view of the current intelligent agriculture"s collection and processing of production site data and the control requirements of related equipment, ZigBee, WiFi, GPRS traditional wireless sensing technology has short transmission distance and signal interference in large-scale farms and greenhouse environmental monitoring systems. The network is complex and other shortcomings. This paper proposes an IoT intelligent farm environment monitoring system based on lora technology. The system completes the detection of various environmental parameters in the laboratory environment, and realizes lighting control, irrigation control, cooling control and people. Machine control, after establishing the experimental model to verify the feasibility of the technology, applied to a dragon fruit greenhouse, and completed data acquisition and analysis, the practice proves that the system has the advantages of long transmission distance and low power consumption while completing data acquisition.