The invention provides a mold core for manufacturing a high-temperature
alloy hollow blade. The mold core is placed in a
wax injection mold to fabricate a
wax pattern and the
wax pattern covered with the mold core is used for fabricating a
ceramic mold case; two positioning grooves are formed at the center positions of the front and rear two surfaces of the blade tip core head of the mold core; the positioning grooves are internally tapered grooves and the center lines of the positioning grooves are coincident with each other; and a pair of convex pins matched with the blade tip is arranged corresponding to the blade
tip position of the wax injection mold. The mold core for manufacturing the high-temperature
alloy hollow blade provided by the invention is characterized in that in mold core design, the shape of the core head part is simplified, and
exposure of the blade root core head is eliminated so as to reduce involvement with the wax injection mold and the
ceramic mold case, so that core making work becomes easy and the damage of the mold core is reduced. The mold core has certain degree of rotation freedom at the blade top core head in the
directional solidification process of the high-temperature
alloy hollow blade in the
ceramic mold case, and the blade root core head is capable of completely and freely stretching in the vertical direction; therefore, the deformation and breakage of the mold core are greatly reduced, and the yield of the hollow blade is obviously improved.