With the rapid growth of science and technology, the Internet of Things (IoT) technology has matured and attracted the attention of many researchers. The development of agricultural modernization leads to the gradual emergence of intelligent management gradually taking root in agricultural production. Among many technologies in the IoT technologies, low-power Wide Area Network (WAN) technology has the characteristics of reliable and stable transmission with long distance and low power consumption. This is very useful for data transmission in special environments, especially for orchards in mountainous areas. This paper proposed a new agricultural Internet of Things in orchard management based on multi-sensors, such as DHT11 for temperature/humidity and GY-30 for illumination, the Long Range (LoRa) technology for transmitting the collected data or control command between the terminal and data cloud center, etc. Setting a low-power IoT sensor network in the orchard can remotely measure the parameters in the orchard. LoRa WAN is used to transmit data to the central node. In order to reduce power consumption and cost, a single monitoring node selects two power supplies, a solar power supply and a power supply, and the power supply can be turned on remotely by users in special circumstances. Experiments in different environments in the peach orchard show that the monitoring system has enough reliability and accuracy, and is suitable for environmental monitoring in orchards in remote areas or areas with complex terrain.