Field detection is a modern technology for timely understanding of crop information, and the traditional detection method is wired detection, but as far as field layout is concerned, wired detection is not only large in engineering quantity, inconvenient in operation, and difficult in maintenance, which is not good for long-term implementation. Therefore, this paper proposes a detection system that combines the application of wireless sensing technology with field detection. It mainly combines Zig Bee with wireless sensing technology to realize convenient field environment detection. This paper mainly studies the hardware design of the protocol, analyzes the characteristics of the protocol network, and proposes the algorithm combining the network protocol and wireless sensor network, so as to realize the terminal detection of farmland environment. Through the application of the system, the results show that the actual temperature difference of the air measured by the system is ±0.6 ℃, and the actual error of the measured humidity is ±5%RH. It can be seen from the data that this detection system has feasibility and credibility.