NOVELTY - Hollow casting ceramic core comprises 16-21 wt.% mineralizer, 15-20 wt.% plasticizer, 0.2-0.3 wt.% cerium oxide, 0.1-0.2 wt.% oleic acid, and balance rare earth coated composite powder. The mineralizer has fineness of 50-200 mu m. The mineralizer is titanium dioxide, magnesium oxide, and/or aluminum oxide. The plasticizer comprises 80-90 pts. wt. paraffin wax, 3-4 pts. wt. propolis, 4-5 pts. wt. terpene resin, 1-2 pts. wt. polyethylene oxide, and 0.1-0.2 pts. wt. silane coupling agent KH550.    USE - Hollow casting ceramic core used for manufacturing high pressure turbine blade.    ADVANTAGE - The ceramic core has low cost, does not produce crack, has low shrinkage rate, high temperature strength, high temperature heat stability and good size precision, and can make complex cavity of thin-wall castings.    DETAILED DESCRIPTION - Hollow casting ceramic core comprises 16-21 wt.% mineralizer, 15-20 wt.% plasticizer, 0.2-0.3 wt.% cerium oxide, 0.1-0.2 wt.% oleic acid, and balance rare earth coated composite powder. The mineralizer has fineness of 50-200 mu m. The mineralizer is titanium dioxide, magnesium oxide, and/or aluminum oxide. The plasticizer comprises 80-90 pts. wt. paraffin wax, 3-4 pts. wt. propolis, 4-5 pts. wt. terpene resin, 1-2 pts. wt. polyethylene oxide, and 0.1-0.2 pts. wt. silane coupling agent KH550. The plasticizer is prepared by heating and softening the terpene resin, adding polyethylene oxide, stirring uniformly, adding the rest raw materials, stirring at 600-800 revolutions per minute (rpm) to disperse for 4-6 minutes, cooling and discharging. The rare earth coated composite powder is prepared by selecting silicon dioxide with fineness of 70-100 mu m, polyethylene powder with fineness of 150-200 mu m, and aluminum oxide with fineness of 40-60 mu m; mixing polyethylene powder and aluminum oxide, adding triallyl isocyanurate, heating for 4-6 minutes, stirring at 30-35 degrees C, adding urea, heating to 55-60 degrees C, stirring for 10-20 minutes, drying, and grinding into mixed powder; mixing alumina powder and mixed powder, and ball-milling uniformly to form base powder; mixing inorganic zirconium salt and inorganic yttrium salt in container filled with deionized water, stirring and heating to obtain to form rare earth oxide precursor solution; mixing the base powder and precursor solution, regulating pH value of solution to 8-10 to obtain liquid mixture; and drying the liquid mixture to form dried powder, and sintering the dried powder at 1200-1400 degrees C for 0.5-20 hours.