The invention relates to a tapered embedded locating method for a silicon-based ceramic core and an aluminium-based ceramic shell. The method comprises requirements as follows: 1) locating grooves are designed on locating surfaces of the ceramic core, wherein when one groove is used, a quadrate-tapered groove is selected, and when two locating grooves are used, the two locating grooves are tapered grooves; 2) a wax member, in a wax mould design, is provided with locating holes corresponding to the locating grooves; and 3) a small-planar locating mode is selected for other assistant locating; a weak area, where blade exhausting slots are located, is provided with a free end; and the thickness of the free end is 0.1 mm-0.5 mm. The locating method provided by the invention is advantageous in that the ceramic core is stably located in the ceramic shell; enough space is provided for expansion and contraction when the ceramic core is subjected to high temperature phase transitions; metallurgical defects, which are caused by locating problems of silicon-based ceramic cores and aluminium-based ceramic shells, such as out-of-tolerance blade sizes, slant blades, leak blades, broken cores, and the like are prevented; operation is simple and reliable; additional cost is very low; and the product qualified rate increases from 20% to 90%.