In order to improve the agricultural automatic and intelligent level, this article analyzes the research situtation domestic and foreign agricultural Internet of things, and constructs the model of agricultural informationization based on Internet of things. The model has three sub models: agricultural information collection modle, agricultural information transmission model and intelligent agriculture information processing model, which corresponds perception layer, network layer and application layer of Internet of things respectively. The paper detailed describes the whole frame，hardware composition and software flow of the agricultural information collection model，the hardware composition of module and structure design of wireless sensor networks in agricultural information transmission model, finally the structure diagram and interface design of the agriculture intelligent information processing modle are also introduced briefly.