To provide a consistent crushing system for grinding fine powder raw materials consisting of two or more metal oxides containing aluminum oxide to obtain a uniform fine grinding mixture.

The consistent crushing system includes the steps of: [a pretreatment step] feeding a plurality of raw materials and a solvent into a cylindrical crushing chamber of a ball mill to carry out a slurrying; stirring the material in a stirring tank and accumulating in a tray after stirring; drying the tray by a boxy drying machine to make a block object; [a crushing step] coarse-grinding the block object by a jaw crusher; transporting by a transport machine after coarse-grinding to accumulate in a fixed type hopper; supplying a constant amount from the hopper to a double roll crusher to crush; classifying the crushed object to accumulate in the hopper; fine-grinding the crushed object accumulated in the hopper using a vibration mill fine grinding mill; accumulating the fine crushed object in a pail can; carrying out all of [the crushing step] by a closed type; and [a post-processing step] mixing the fine crushed object uniformly using a V-typed mixer. The system controlling all the steps is provided.