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Aiming at the shortcomings of ZigBee, WiFi and GPRS traditional wireless sensor technology in greenhouse environmental monitoring system on a wide range of farms, this paper presents a low power farm environment monitoring system based on LoRa technology. The system relies on the idea of things networking, divided into three layers of structure. The sensing layer as part of the information collected by the MSP430 microcontroller, temperature and humidity sensors and light intensity sensors and other components; Network layer using LoRa wireless spread spectrum communication technology for data transmission, can achieve fixed-point, power, transmission and monitoring four modes; Application layer to the network layer of data transmission and preservation, and ultimately to achieve lighting control, irrigation control, cooling control and man-machine control.