The invention discloses a porous ceramic-microcrystalline glass composite insulation decorative plate and a preparation method thereof. The porous ceramic comprises ceramic tile raw material, additive, pore forming agent and foaming agent, and the microcrystalline glass comprises SiO2, CaO, ZnO, Al2O3, Na2O, K2O, etc. The preparation method comprises the following steps: firstly uniformly mixing ceramic tile raw material, additive, pore forming agent and foaming agent, and conducting ball milling to obtain an ultrafine powder slurry; then granulating, drying, and conducting compression molding; drying the green ware body and then sintering in a roller kiln or a shuttle kiln; then, melting quartz sand, limestone, soda ash and other minerals or chemical raw materials to obtain a glass melt, carrying out water quenching on the glass melt to obtain glass particles; screening the dried glass particles and then classifying, paving on the surface of a porous ceramic plate, then pushing into a crystallization kiln to sinter, crystallize, anneal and cool the glass particles to form a microcrystalline glass layer; in the process, simultaneously compounding the microcrystalline glass with the porous ceramic plate to form the porous ceramic-microcrystalline glass composite insulation decorative plate.