Abstract: Based on the analysis of the effects of ecological environmental factors such as atmosphere and soil temperature and humidity on the growth of tea trees, a tea garden ecological environment monitoring system suitable for mountainous areas of Fujian Province was designed and made. The system uses STM32 Series MCU to obtain various tea garden ecological environment factors through external sensors, and transmits the data obtained from regular monitoring to cloud storage management through NB-IoT based communication module. The system adopts modular structure, uses NB-IoT network, and is powered by solar module and battery, which is easy to deploy. The monitoring points can be freely installed in the vast mountain tea gardens, with the characteristics of low power consumption, wide coverage and less maintenance. It can overcome the defects that the general monitoring methods are not suitable for use in the mountain tea gardens, and continuously obtain the big data of the ecological environment of the tea gardens. At the same time, the developed system has the function of viewing data information through PC or ordinary smart phone.Through the analysis of the obtained data, it can guide the production of tea farmers, and has good economic and social benefits.