Porous cordierite ceramic prepared by taking walnut hull powder as pore former

The invention relates to a porous cordierite ceramic prepared by taking walnut hull powder as a pore former. The ceramic is prepared by mixing and grinding talcum, kaoline, calcined kaoline, alumina, aluminum hydroxide, quartz and MC (Methyl Cellulose) By weight percentage, putting into a body mold for forming, drying a formed body, roasting, and holding the temperature for a certain time. A method is used for the porous cordierite ceramic prepared by taking the walnut hull powder as the pore former; the ceramic meeting national standard requirements is obtained; at the same time, apparent porosity of the ceramic reaches above 50%; a pore size reaches about 2.5 micrometers; a pore size scope is 2.0-3.0 micrometers; and the pore distribution is uniform, so that PM2.5 (Particulate Matter 2.5) in gas is absorbed to achieve an effect of purifying air. A walnut hull has a higher decomposition temperature which is matched with a ceramic forming temperature of the cordierite ceramic, so that uniform pores can be formed in the ceramic body more easily; compared with an inorganic pore former, the walnut hull is decomposed more completely without any impurities, and a cordierite pure phase of the ceramic is unaffected.