A spinel large-specification ceramic heat accumulator is characterized in that the heat accumulator is of a columnar structure, a plurality of channels penetrating through the column are formed in the heat accumulator, and the heat accumulator is formed by sintering inorganic powder and additives, wherein the inorganic powder comprises, by weight, 25-35 parts of MgAl2O4, 5-11 parts of nano zirconium oxide, 5-12 parts of graphite, 2-4 parts of silicon nitride and 0.1-0.3 part of beryllium oxide. The heat accumulator has good forming performance and shape-keeping performance. By means of the formula and a production method, the channels of the heat accumulator are dense, the wall thickness is small and only 1 mm, the section size is large and larger than 100 cm<2>, the length-diameter ratio is high, length reaches 1000 mm, and all the channels have the advantages of being small in resistance, little in accumulated dust, not likely to be blocked, good in dust discharge performance and the like.