The invention relates to a high efficiency ceramic blank casting slip. The ceramic blank casting slip comprises the following raw materials, by weight, 8-9 parts of Zhangcun soil, 6-7 parts of Zhangwu clay, 8-9 parts of Tangshan knag, 9-10 parts of Shanxi knag, 13-14 parts of Qinyang soil, 2-3.5 parts of Guangdong ball clay, 0.7-1.3 parts of Guangdong black mud, 1.4-1.7 parts of dolomite, 5-6 parts of Weichang clay, 9-10 parts of Fengrun sandstone, 14-15 parts of Luanxian feldspar, 3-4 parts of porcelain powder, 1-2.5 parts of Zhanjiang porcelain clay B, 7-8.5 parts of Xuanhua porcelain stone, 3-4 parts of northeast black mud, and 1.5-3 parts of Zhanjiang porcelain clay A, wherein dolomite in the raw materials is ground into a dolomite slurry, and the dolomite slurry and other raw materials, which are mixed, are ground in a ball mill according to a raw materials: balls: water ratio of 1:1.8:0.4. The raw materials of the casting slip are easy to obtain, a large ceramic product is subjected to slip casting twice each day, the slip suction speed is fast, the ceramic product production efficiency is improved, and the output is increased, so the ceramic blank casting slip is suitable for the large scale production.