Carbon dioxide is the necessary material for plant photosynthesis, and building favorable carbon dioxide environment in facilities is essential for crop growth. The design of an environment carbon dioxide precision control system based on wireless sensor network (WSN) was introduced, which was composed of master node, monitoring node and fertilizing node. Information interaction among nodes were achieved with ZigBee protocol, which was a general protocol for wireless sensor network. Monitoring node was used to monitor real-time carbon dioxide concentration, temperature and light intensity in facilities environment. With a feedback control, master nodes achieved dynamic adjustment of carbon dioxide based on different growing seasons for various plants in facilities and combining optimum thresholds of temperature and lights. To improve the disadvantage of uneven carbon dioxide implementation, double M type conductive pipe was deployed in facilities. Meanwhile, different hole sizes on the pipe were designed for acquiring the same instantaneous flow. In collaboration with convection device, fertilizing node controlled the carbon dioxide emissions through gas tank passing and breaking, and guaranteed the uniformity of carbon dioxide implementation. The results show that the relative error between the target and the real-time value is less than 3.5% in solar greenhouse with area of 36.66m2. The designed experiment result shows that the variation coefficient of carbon dioxide concentration among monitoring nodes is less than 2.93% in glasshouse with area of 27.74m2, which proves that the system can realize precise and uniform fertilizing of carbon dioxide.