The utility model discloses a tool for casting a NiCrAlYSi alloy target. The tool comprises a steel bucket, wherein an opening is formed in the upper end of the steel bucket, and a graphite base plate is arranged on the bottom of the steel bucket; a graphite mold is arranged on the graphite base plate; an insulated feeder is matched with the graphite mold is arranged at the upper end of the graphite mold; the outer wall of the graphite mold is spirally wound with a cooling water pipe, one end of the cooling water pipe penetrates out of the steel bucket to serve as a water inlet pipe, and the other end of the cooling water pipe penetrates out of the steel bucket to serve as a water outlet pipe, and the water inlet is located below the water outlet; a space on the outer side of the graphite mold in the steel bucket is filled with aluminum oxide sand, and the top end of the aluminum oxide sand does not exceed the upper end of the graphite mold. The tool has the characteristics of simple structure, high use reliability, low cost, strong repeated operability and the like.