The invention discloses high-performance calcium carbonate used for stone slabs and a preparation method of the high-performance calcium carbonate. The high-performance calcium carbonate used for stone slabs comprises the following raw materials: a calcium carbonate crushed matter, a grinding aid, dioctyl succinic acid sodium sulfonate, stannous chloride, magnesium oxide, pentasodium DTPA, a modifier, 3-aminopropyltriethoxysilane, bis(2-ethylhexyl) phthalate, modified polyacrylate, ethylene bis(stearamide), 2-(2'-3-hydroxy-3',5'-di-tert-phenyl)-5-benzotriazole chloride, polyacrylamide and a stabilizer. The high-performance calcium carbonate is prepared according to the steps of stone slab cleaning, impurity removal, water removal, crushing, grinding, surface modification, performance adjustment, smashing, drying and the like. The high-performance calcium carbonate used for stone slabs is added into the stone slabs, little agglomeration occurs, the dispersibility is good, and the mechanical properties are obviously improved.