Abstract: In order to explore the influence of hydraulic cavitation modification on the aggregate structure and physicochemical properties of corn starch, this experiment took corn starch as the research object, and treated it with hydraulic cavitation for 10, 20, 30, 40 and 50 min, respectively. After treatment, the particle size distribution, microscopic morphology structure, crystalline structure, molecular short-range order structure, the swelling power and solubility of corn starch were tested. The results showed that after hydrodynamic cavitation treatment of starch, the average particle size of corn starch granules increased, conical cracks and unevenly distributed circular pores appeared on the surface of starch granules, and the relative crystallinity increased from 22.25% to 29.23%. The degree of molecular short-range order first increased and then decreased, the swelling power increased from 9.87 to 13.10 g·g⁻¹, and the solubility increased from 8.94% to 11.76%. The cavitation effect produced by hydraulic cavitation could change the aggregated structure of corn starch.