The invention discloses a special silicon brick. The special silicon brick is prepared from a main material, an auxiliary material and a binding agent, wherein the main material comprises the following components in percentages by weight: 20-25 percent of bauxite chamotte with granularity of more than 2 mm and not less than 4 mm, 2-20 percent of bauxite chamotte with granularity of more than 1 mm and not less than 2 mm, 15-20 percent of bauxite chamotte with granularity of not more than 1 mm and 10-20 percent of silicon carbide with granularity of not more than 1 mm; the auxiliary material comprises the following components in percentages by weight: 5-10 percent of electrofused corindon thinner than 325 meshes, 5-10 percent of sialon thinner than 200 meshes, 5-10 percent of andalusite with granularity of not more than 1 mm, 3-5 percent of soft binding clay thinner than 200 meshes; and the binding agent is a spent pulping liquor at the concentration of 1.18-1.25 g/cm<3> and accounts for 4-4.5 percent of the sum of the weight of the main material and the auxiliary material. In the invention, by utilizing a strict scientific proportioning, high intensity ceramic combination is finally obtained for various materials, thereby the intensity of the product is greatly enhanced, the high temperature performance is stable and the high temperature wear resistance is better.