The invention relates to a casting method and a device for ingot metal such as aluminum, silver, zinc and zinc-based alloy ingot. The invention adopts the method that the molten metal is cast into an ingot mold at first, then at least one surface of the ingot is heated and insulated during the solidification process, to ensure that the cooling speed thereof is greatly reduced and less than that of the other surfaces of the ingot, and the heating is not stopped until the volume of the molten metal in the center of the ingot during the cold shrinkage process is fully compensated by the molten metal on the surface. The device comprises a casting mechanism and a die, the die adopts a vessel with an opening, an insulating cover for covering the opening is also arranged on the die, and a heating device is arranged in the insulating cover. The invention can be used for ingot metal such as aluminum, silver, zinc ingot, zinc-based alloy ingot and the like cast by the die with the opening. The invention ensures that the volume of the surface can be compensated till the volume everywhere in the ingot metal is completely filled and shrunk through delaying the hardening time of one surface of the ingot metal; therefore, the influencing factors of formation of the internal shrinkage hole are radically eliminated, and the effect of eliminating the internal shrinkage hole is realized.