In order to expand the development of lotus leaf in food processing,insoluble dietary fiber (IDF) of lotus leaf was extracted by high shear emulsification.Its basic physical properties of the IDF were determined and compared with the IDF extracted by conventional smashing and ball grinding.The results showed that the lotus leaf IDF yield extracted by high shear emulsification was the highest (83.84%) at a shear speed of 8 000 rpm,a shear time of 4 min,an acid concentration of 0.25 mol/L,and an acid hydrolysis temperature of 45 ℃.The water solubility,water holding capacity,oil holding capacity and expansibility of the IDF were 13.81%,5.65 g/g,1.97 g/g and 1.93 mL/g,respectively.Compared with ball grinding,the treatment time of high shear emulsification was shorter,the lotus leaf fiber structure was not completely destroyed,the fiber in SEM diagram showed a bundle structure and distinct layers,and the water solubility was lower,the water holding capacity and expansion property were higher.High shear emulsification technology has a good application potential in the processing of high-fiber food.