The invention discloses a method for the selection and the preparation of the raw materials of a high-strength suspension porcelain insulator glaze. The raw materials comprise kaolinite type clay, talcum, feldspar, refined quartz, carbonate, porcelain powder, water glass and calcined alumina. The invention is characterized in that the kaolinite type clay is 10 to 15%, the talcum is 10 to 15%, the feldspar is 25 to 35%, the refined quartz is 25 to 35%, the carbonate is 5 to 10%, the porcelain powder is 1 to 8%, the water glass is 0.1 to 0.5% and the calcined alumina is 10 to 15%. The particle size of each clay raw material is 20 to 40 mushes, the particle size of other raw materials is 180 to 200 mushes. The bending strength of porcelain blank can be improved by 25 to 40% after being glazed by the glaze, the sintering temperature of the porcelain insulator after being glazed is 1200 to 1350 DEG C.