The invention relates to a spin-casting device and a spin-casting centrifugal disk. The spin-casting device comprises a fixed frame, the fixed frame is provided with a crucible for holding metal raw materials in a molten state, a centrifugal disk body is arranged under the crucible, and the centrifugal disk body rotates at a high speed to atomize and throw out the metal raw materials and the metalraw materials are attached to the inner wall of a cylinder-shaped die; and the centrifugal disk body is further provided with a cooling medium flow channel, and a cooling medium can cool the disk surface of a disk body. The cooling medium is led to the cooling medium flow channel of the centrifugal disk body in the centrifugal disk body to cool the disk surface, and when the metal raw materials are poured downwards onto the centrifugal disk body by a flow guide pipe under the crucible, heat exchange is carried out between the metal raw materials and the disk surface, so that heat of the metalraw materials is reduced, cooling can be carried out faster; and in the process of throwing out, the metal raw materials can form semi-solid droplets smoothly, and the phenomenon of sample collapse due to the fact that the atomized particles still keep in a liquid state when colliding with the inner wall of the cylinder-shaped die and the droplets on the die fuse and flow together is avoided, sothat a produced metal hollow ingot has a flat surface, uniform thickness and small grain size.