The invention relates to a carbon brick special for a blast furnace hearth and a preparation method thereof. The technical solution is as follows: firstly, coal tar pitch, stearate, polyphosphoric acid, a surfactant, an additive and a complexing agent are mixed, heat-treated, crushed and sieved to obtain a sieving material A with the particle size less than 0.088mm ; then the sieving material A, maleic acid, zinc oxide powder, copper powder and the complexing agent are uniformly mixed, heat-treated, crushed and sieved to obtain a sieving material B with the particle size less than 0.088mm; then electrically calcined anthracite with the particle diameter of 8 to 1mm, electrically calcined anthracite with the particle diameter less than 1mm and greater than or equal to 0.088mm, amorphous graphite, the sieving material B, thermosetting phenolic resin, manganese powder and cobalt powder are mixed and milled, subjected to compression molding, cured, and roasted under the carbon burial atmosphere and the condition of 1300 to 1500 DEG C for 5 to 8 hours to obtain the carbon brick special for the blast furnace hearth. The carbon brick and the preparation method thereof, provided by the invention have the advantages of wide sources of raw materials, simple process and low production cost. The produced carbon brick has the advantages of high strength, large thermal conductivity and excellent resistance to molten iron melting loss.