The invention discloses a foam ceramic filter, which comprises the following raw materials in parts by weight: 20 to 80 parts of carbon, 1 to 20 parts of hollow microspheres, 1 to 70 parts of mica, and 20 to 90 parts of ultrafine silicon oxide powder. The invention also discloses a process for preparing the filter. Based on the conventional filter raw materials, light materials, namely the microspheres and the mica are added specially, so that the manufactured product has light weight, and has excellent mechanical performance and thermal shock resistance.