The invention discloses a homogeneous plate with good heat preservation and heat insulation effects and a preparation method thereof. The homogeneous plate is prepared from the following raw materialsin parts by weight: 25-30 parts of lime powder, 22-25 parts of quartz sand, 18-22 parts of aluminum silicate fiber, 14-18 parts of borax, 10-12 parts of polyether polyol, 7-9 parts of polyester polyol, 6-8 parts of triethylenediamine, 2-3 parts of potassium isooctoate-dipropylene glycol, 5-7 parts of pentane, 4-8 parts of pentafluoropropane, 3-7 parts of water, 4-9 parts of tris(2-chloropropyl) phosphate, 4-8 parts of a foam stabilizer B8460, and 24-45 parts of polyphenylpolymethylene polyisocynate; according to the formula, the homogenizing plate has the advantages of low thermal conductivity, low density, high strength, light overall mass and good heat preservation and insulation, the step of cutting is omitted by injecting the castable into the storage box, a plurality of homogenizingplates can be continuously produced, the operation is automatic, the labor intensity is low, and the production efficiency is high.