Abstract: In order to improve the utilization rate of coal measure kaolinite gangue resources, this paper takes coal measure kaolinite in Heidaigou area of Inner Mongolia as the research object, and studies the iron and titanium removal of coal measure hard kaolinite contained in it. The process mineralogy of coal gangue was analyzed by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscope (SEM) and microscope test from the aspects of chemical composition, microstructure and mineral composition. Different magnetic species were used to conduct high-gradient magnetic separation of iron-bearing and titanium-bearing minerals, and the single-factor experiment showed that magnetite powder was superior to artificial ferrite. The orthogonal experiment shows that magnetic separation current 6 A, ore timing 20 s and slurry concentration 45% are the best experimental conditions, and the iron removal rate is 35.63% and the titanium removal rate is 39.29%. The whiteness of the final product is 80.96% after calcination, which meets the whiteness requirement of calcined kaolin used in rubber and plastic industry.