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In order to improve the blindness and randomness of current soil fertilization and soil data management, a soil data collecting, analyzing decision-making system based on field programmable gate array(FPGA) is proposed in this paper. This system builds the soil data collecting module on FPGA, which is designed for gathering temperature, humidity, pH, major elements and trace elements content in soil and transmitting the collected data to the host computer by GPRS. The host computer establish database, model base and knowledge base by using expert’s information and soil testing and fertilizer recommendation technology, and decision-making results will show suitable plant,evaluation of fertility and fertilization scheme. Test result show that the system can provide valid solution for crop planting and has a broad application prospect in the field of agriculture.