Copper ingot for gravity casting and casting method thereof

The invention relates to a copper ingot for gravity casting and a casting method thereof. A casting raw material of the copper ingot consists of two parts including a basic raw material and an additive, and is prepared by components; the casting raw material is heated and fused; a refining agent is added and evenly stirred to remove impurities; a refiner is added and evenly stirred to refine grains; a sample is taken to check the mobility of molten metal and the compositional ratio of all elements; if the result is not conform, the raw material or the refining agent are added again; the copper ingot is cast, and is naturally cooled; the performance of the copper ingot is inspected; and the grading is performed. The copper ingot for gravity casting has such advantages as good fluidity of the molten metal, few defects of cast products, high yield and good polishing performance, reduces the workload of workers, and improves the production efficiency.