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A scheme is promoted which builds an auto system based on Fuzzy Control and wireless sensor network for water saving irrigation. The wireless sensor network is consists of sensor node, coordinator node and irrigation controller node. Here sensor node is responsible for gathering information such as soil humidity and air temperature regularly, and send it to the coordinator node. Fuzzy controller embedded in the coordinator node takes soil humidity and air temperature as its input and obtained water demand amount of crops through fuzzy inference and fuzzy judge and output it to irrigation controller node. Irrigation controller node controls the implementation of automatic watering. In this article, we describe the implementation scheme of sensor network node and fuzzy controller in detail. The experimental results show that the system can quickly and accurately calculate water demand amount of crops, which can provide a scientific basis for water-saving irrigation. Instead of traditionally wired connection, the wireless design made irrigation intelligent and convenient.