The invention relates to an ultra-high-density ultra-high intensity ceramic particle proppant and a preparation method thereof, and belongs to the technical field of solid proppants for an oil and gas well fracturing process. The ultra-high-density ultra-high intensity ceramic particle proppant provided by the invention is prepared from the following ingredients in percentage by weight: 10 to 30 percent of magnesium aluminate spinel, 5 to 15 percent of brown aluminum oxide, 30 to 60 percent of raw bauxite, 10 to 20 percent of sintered bauxite, 5 to 25 percent of alpha aluminum oxide, 0.1 to 2 percent of composite mineralizers, 0.1 to 2 percent of dolomite and 4 to 8 percent of manganese ore. The ultra-high-density ultra-high intensity ceramic particle proppant provided by the invention has the bulk density being 1.93 to 2.03g/cm<3> and the apparent density being 3.43 to 3.63g/cm<3>; when the closing pressure is 103Mpa, the crushing rate is lower than or equal to 5 percent; the acid solubility is 4.01 to 4.63 percent; other indexes also conform to the national petroleum and natural gas industry standard SY/T 5108-2014.