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A microwave drying feedback control system was designed for the purpose of the microwave drying for fruits and vegetables and other agricultural products. The realization principle and each function module of the system were discussed in detail. The design ideas and realization methods of the system that consist of microwave drying unit, temperature and power control unit, weight detection unit and upper computer control unit were focused to be introduced. The power of a reconstructed home microwave oven was calibrated by a water heating experiment. The mathematical model between microwave power and voltage of the power control circuit was established based on the experiment data. Constant temperature drying experiment was carried out with ginger as sample. It is showed that the system can record temperature, weight and other data in real time. It is also showed that the microwave power can be adjusted continuously and steplessly based on temperature feedback control.