The invention discloses a sintered refractory brick and a making method thereof, and relates to the field of refractory materials. The refractory brick comprise modified quartz powder, magnesite slag, dolomite powder, bauxite, diopside powder, lime milk, expanded graphite, niobium carbide powder, boron nitride powder, silicon phosphide powder, silicon carbide fibers, an activator, a water reducer, foaming agent and a foam stabilizer. The refractory brick is made through mix-grinding, standing ageing, drying and calcination of the above raw materials. The making method of the refractory brick has the advantages of simplicity, low energy consumption during production, and short time; and the refractory brick produced in the invention has the advantages of high compressive strength, excellent thermal shock resistance, low thermal conductivity, effectively prolonged service life in a high temperature furnace and a kiln, and suitableness for being promoted and applied.