The invention discloses a core for a ceramic core inserting mold. The core comprises a core body and a top end connected to one end of the core body. The core body comprises a cylindrical segment and a conical segment. The conical segment comprises a small end with the minimum diameter and a large end with the maximum diameter, and the cylindrical segment is connected with the small end of the conical segment. According to the core for the ceramic core inserting mold, due to the fact that the core body of the core comprises the cylindrical segment and the conical segment, and the conical segment has certain conicity, the tapered core is formed; and compared with a cylindrical core in the prior art, the risk of core bonding in the product demolding process can be reduced, the fault rate is reduced, the problem that an inner hole of a product is scratched by the existing cylindrical core is solved, meanwhile, core abrasion is effectively reduced, and the service life of the core is prolonged. Meanwhile, the invention discloses the ceramic core inserting mold with the core.