The invention discloses a method for preparing artificial quartz stones by using kaolin desliming tailings, which relates to building decoration materials and comprises the following steps of: stirring unsaturated resin and colorants, adding the kaolin desliming tailings, natural river sand and silicon dioxide powder, performing stirring, adding an accelerator, a coupling agent and a curing agent, performing stirring and injecting the mixture into a mould; feeding the mould into a vacuum box for vacuumizing, pressing and forming the mixture and performing curing and heating; and performing cooling de-molding to remove the mould, performing polishing and finally cutting the molded mixture into standard artificial quartz stone slabs, wherein artificial quartz stones are made from the following raw materials in percentage by mass: 12 to 65 percent of natural river sand of 10 to 120 meshes, 15 to 35 percent of natural river sand of larger than 120 to 1,500 meshes, 5 to 15 percent of silicon dioxide powder, 0.1 to 19 percent of unsaturated resin, 0.1 to 5 percent of accelerator, 0.1 to 3 percent of coupling agent, 0.1 to 5 percent of curing agent and 0 to 5 percent of colorant. The method reduces initial investment, and is convenient to operate, easy to implement, simple and reasonable; and the products have the natural veins, stripes and rich colors of marbles, also have the hardness of the quartz stones and are suitable for industrialization.