The invention relates to a high-performance mineral casting machine tool rack and a preparation method thereof, and belong to the technical field of casting of minerals. The machine tool rack comprises the following ingredients in parts by weight: 100 parts of granite sand, 25-38 parts of beta-SiC, 5-7 parts of kaolin, 22-27 parts of epoxy resin, 20-25 parts of SEPS (styrene-ethylene-propylene-styrene block copolymer) particles, 13-21 parts of a curing agent and 18-29 parts of modified glass fibers. The prepared machine tool rack has the advantages of being excellent in compressive strength, tensile strength and anti-bending strength, good in heat-conducting property, excellent in anti-seismic property, higher in glossiness and long in service life.