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Aiming at the problems of traditional agricultural WSN such as short distance, high power consumption. A field information wireless acquisition system based on LoRa technology was proposed. By analyzing the composition of the wireless network, the design principles of the network parameters were given, the network structure was optimized, the networking difficulty was reduced, and the networking efficiency was improved.Choosing STM32L053 processor, SHT11 digital temperature and humidity sensor and SX1276 wireless chip to form a compact low power node hardware circuit. A low power and low collision star wireless network structure was designed. This system periodically collected sensor data through time-sharing sampling method. The node's power consumption and the selection of time slot length as well as the relationship between packet reception rate and RSSI (Received Signal Strength Indication) were analyzed by experiment. The results show that the system has the characteristics of strong universality, low power consumption, long distance, easy networking, stable and reliable, which can meet the application demand of field information acquisition.