A kind of modern agricultural data acquisition system based on STM32 and 3rd Generation (3G) was introduced in this paper. The system could achieve the long-distance agricultural field for unattended monitoring, the collection of temperature, humidity, light intensity and other aspects data. By using the nRF24l01 wireless network was connected to a temperature and humidity sensor DHT11 and BH1750FVI light sensor. The data collected by nodes were transmitted to the control center. The RT-Thread embedded operating system was the software platform, which used light TCP/IP protocol stack LwIP Point to Point Protocol (PPP) dial of 3G module MC509 to connect to the Internet. It could carry out remote monitoring and management of the farm by the use of mobile phone Application (APP) or computer environment when the data was transmitted to the LEWEI Internet. Experiments showed that the system was stable. This paper provided a solution for wireless remote data monitoring. It had positive significance to improve agricultural management benefit.