At present，most of the agricultural production in China are still in the traditional planting mode，lack of the application of advanced scientific and technological leads to low product quality and low economic efficiency. In view of the above situation，Anhui SIERTE Fertilizer Industry Co.，LTD（hereinafter referred to as SIERTE）has committed to building intelligent agriculture based on big data. Through the analysis of the demands of constructing agricultural big data，this paper designs an open big data platform of agriculture for SIERTE，and focuses on demonstrating two subsystems of “Schooling and Farming with the Help of QR” and “Learning Before Farming in Different Seasons”. Based on the existing Celtic marketing network of SIERTE，“Schooling and Farming with the Help of QR” integrates the advantageous resources of grass-roots service for farmers such as soil fertilizing，plant protecting and agricultural technology promoting. It realizes the integrated agricultural management system by using a variety of information-based equipment. “Learning Before Farming in Different Seasons” is a large comprehensive application platform for guiding farmers to apply fertilizer scientifically. With this，the damage caused by excessive fertilization of soil can be effectively avoided and the crop production can be maximized，making farmers more risk-resistant.