The present invention provides a pre-triturating device, for solving a problem that the food should be pre-processed in the prior art to make the user inconvenient. According to the problem described above, after the pre-triturating device of the present invention is installed in the food processing machine, by connection between the driving shaft or the shaft hole and the shaft hole or the connecting shaft of the center of the bottom surface of the pre-triturating device, in the pre-triturating procedure, the user can relieve the food pre-processing procedure when processing the food, and the processing food is easier and quicker. Because the food is pre-triturated, the loader of the mixed device is reduced, the life of the machine is prolonged, and the mixing or squeezing juice efficiency is increased.