The invention discloses a ceramic composite toothed roll crusher roll tooth. The ceramic composite toothed roll crusher roll tooth comprises a roll tooth body, ceramic blocks and abrasion-resisting alloy layers. The ceramic blocks are embedded and cast on the top face, the front side face and the rear side face of the roll tooth, the outer surfaces of the ceramic blocks protrude out of the surfaceof the roll tooth body, and the abrasion-resisting alloy layers are arranged in gaps between the ceramic blocks and the roll tooth body and other surfaces except the bottom face and the right side face of the roll tooth in a bead weld mode. The preparation process of the ceramic composite tooth roll crusher roll tooth comprises the steps of ceramic block preparation, sand mold preparation, casting, knockout, bead weld and hot treatment. According to the ceramic composite toothed roll crusher roll tooth and a preparation method thereof, the produced roll tooth has the advantages of being highin hardness, high in abrasion resistance and corrosion resistance and good in anti-impacting performance and can prolong the service life of the roll tooth and reduce the labor intensity of workers.