The invention discloses a system for producing starch or dextrin according to a microwave method. The system comprises a feeding system, a microwave system and a loading and storing system, and the feeding system, the microwave system and the loading and storing system are in sequential connection. The feeding system comprises a raw material barrel, a feeding device, a delivery pipeline and a discharging device; the microwave system comprises multiple microwave devices and multiple groups of stirring mechanisms; the loading and storing system comprises a first loading machine, a second loading machine and a storing and stirring device. The system for producing starch or dextrin according to the microwave method has the advantages that raw material distribution uniformity can be improved effectively to prevent compaction of raw materials; the problem of surface gelatinization caused by processing of starch and dextrin is reduced, and effectiveness in dehumidification and flying dust reduction can be realized; uniformity of finished products is improved, and caking is prevented.