The invention discloses a large compound energy-saving refractory brick. The brick is composed of a heavy layer and a light layer, wherein the heavy layer adopts a refractory material comprising 50-70wt% of sal refractory aggregates, 5-15wt% of high temperature cement, 5-10wt% of silicon micropowder, 6-18wt% of high aluminum micropowder, 4-14wt% of clay powder, and 0.1-0.3wt% of a water reducer; and the light layer adopts a refractory material comprising 50-70wt% of microporous mullite light aggregates, 5-15wt% of the high temperature cement, 5-10wt% of the silicon micropowder, 6-18wt% of the high aluminum micropowder, 4-14wt% of the clay powder, 2-8wt% of an expanding agent and 0.1-0.3wt% of the water reducer. The large compound energy-saving refractory brick of the invention has the advantages of light whole specific gravity, light weight, strong strength, good thermal shock resistance, high refractoriness (above 1730DEG C), small thermal conduction coefficient, installation convenience and the like.