The water chestnut starch were tested through intermittent microwave drying, and the effects of comprehensive quality were researched including water content, whiteness, acidity and iodine blue value of chestnut starch, optimized by orthogonal tests. The results showed that the optimum drying conditions for water chestnut starch intermittent microwave were microwave power 210 W, loading 1.47 kg/m², heating for 14 min and intermittent time 0.75 min. Under the optimum conditions, after intermittent microwave drying, water content of water chestnut starch was 10.12%, the whiteness was 97.5%, and the acidity was 0.21 mL, iodine blue value was 17.90. At present, water content reached the safety standard, and whiteness increased slightly, with the acidity decreasing and iodine blue value increasing. Therefore the quality was improved. The results could provide a reference for the actual production of water chestnut starch microwave drying technology.