The invention discloses an agricultural pest and growth condition forecasting, prevention and control Internet of things, which consists of an agricultural pest and growth condition information acquirer, an information transmission network and an agricultural pest and growth condition forecasting, prevention, control and research center. In an agricultural pest and growth condition forecasting, prevention and control method, a method for acquiring comprehensive agricultural pest and growth condition information, software for processing the comprehensive information and a forecasting, prevention and control expert system database are provided. The agricultural pest and growth condition forecasting, prevention and control Internet of things is constructed creatively; a high-efficiency, high-quality and standardized informationization platform is supplied to develop deep research on various agricultural, forestal, animal husbandry and fishery pests and growth conditions in a large area, and agricultural informationization can be realized really in a large area, so that pests can be prevented and controlled designedly and timely step by step; furthermore, agricultural planting is instructed, and fertilizers are used rationally; therefore, pollution to the environment is reduced greatly, the insecticide resistance of the pests is reduced, and the agriculturally sustainable development is promoted greatly.