The invention relates to a sliding brick containing ferro-silicon nitride and combining with a carbon nano tube and a preparation method of the sliding brick. The sliding brick is prepared from the following raw materials in percentage by weight: 55 to 60 percent of tabular corundum, 15 to 25 percent of white corundum, 3 to 5 percent of alumina powder, 15 to 20 percent of ferro-silicon nitride, 0.5 to 1.5 percent of carbon nano tube, and an additionally added binding agent is 2 to 5 percent of the total quantity of the raw materials of the sliding brick. The preparation method comprises batching, mixing, mechanical pressing, drying, roasting, oil immersion treatment, light roasting carbonization treatment, hooping, polishing, surface coating and finishing a product. The sliding brick provided by the invention is stable in structure, has excellent thermal shock resistance and erosion resistance, continuous sliding times are many, the service life is long and the popularization is facilitated.