The invention relates to a castable cordierite-mullite refractory material which is prepared from 20-40% of 1.2-0.5mm molochite, 10-25% of 0.5-0.088mm molochite, 0-15% of 0.5-0.088mm synthetic cordierite, 10-35% of <0.088mm synthetic cordierite, 0-20% of <0.088mm synthetic mullite, 1-3% of magnesia micropowder, 2-8% of alumina micropowder, 3-10% of silica fume, 0-15% of calcined kaolin micropowder, 0.01-0.1% of additional third-generation water reducing agent and 4-8% of additional water. The production technique comprises the following steps: proportionally weighing the raw materials, mixing, and forming to obtain a green body; and standing for 12-24 hours to demold, curing at normal temperature for 1-3 days, drying at 40-60 DEG C for 1-2 days, and firing at 1150-1350 DEG C. The invention uses <10 mu m magnesia micropowder instead of common magnesia fine powder, adopts high-purity raw materials to improve the high-temperature properties, adopts abundant synthetic raw materials to reduce the firing shrinkage, and adds proper micropowder to widen the sintering temperature range, thereby solving the contradictions between low magnesia amount and high setting rate, between special shapes and dimensions and low manufacturing cost and between the difficulty in sintering and high performance. The invention develops a novel easy-forming easy-sintering technique, and prepares a refractory material product which has the advantages of special shapes and dimensions, high purity, high strength, high temperature resistance and good thermal shock resistance.