Mold core device and die-casting die

The utility model discloses a mold core device and discloses a die-casting mold with the mold core device, the mold core device comprises a mold core needle, a spring and a supporting plate, one end of the mold core needle is used for abutting against one of a fixed mold core and a movable mold core, and the other one of the fixed mold core and the movable mold core is provided with a first through hole allowing the mold core needle to slide; one end of the spring abuts against the other end of the core needle, the spring is used for driving the core needle to be away from the spring, the mold frame is provided with a second through hole for containing the spring, and the core needle can pass through the second through hole; the supporting plate is embedded in the back face of the mold frame and used for supporting the spring, the supporting plate is provided with a first bolt, the first bolt is in threaded connection with the mold frame, and the mold core needle can be conveniently and rapidly replaced by th