Preparation method of calcium-oxide-based ceramic core

The invention discloses a preparation method of a calcium-oxide-based ceramic core, and belongs to the technical field of precision casting of titanium alloy. The preparation method of the calcium-oxide-based ceramic core comprises the following steps of firstly preparing rare-earth-oxide-coated calcium oxide powder; secondly modeling and sintering the rare-earth-oxide-coated calcium oxide powder; and finally obtaining the calcium-oxide-based ceramic core, wherein the calcium-oxide-based ceramic core is prepared from the following raw materials in percentage by weight: 5-15% of plasticizer, 0.001-20% of mineralizer, and the balance of rare-earth-oxide-coated calcium oxide powder bodies, and the sum of the raw materials is 100% in percentage by weight. The calcium-oxide-based ceramic core prepared by the method disclosed by the invention has excellent mechanical properties and can effectively prevent the defect that calcium oxide is easy to hydrate when meeting water.