The invention discloses a production method of an ingot mold for ultra-pure special steel. The production method comprises the following steps that the shape of the ingot mold is determined, and the mold is assembled; a raw material furnace is smelted, the temperature is raised to 1350-1380 DEG C, the furnace is discharged, a nucleating agent is a BaSiFe alloy, the particle size is 30-50 mm, and inoculation is carried out along with flow; a molten metal is cooled to 1280-1300 DEG C to be poured, the molten metal enters a spraying type pouring system of the mold, enters an ingot casting mold cavity from a dead head of a riser box until the ingot casting mold cavity is fully filled, and a straw rope is ignited to lead out gas in the ingot casting mold cavity; after the casting is completed,the mold with sand is subjected to preservation for 48 hours or more, mechanical machining is carried out on an upper end surface and a lower end surface of the cast ingot mold, the inner cavity and the shape are cleaned, and the required ultra-pure special steel ingot mold is obtained. The cast ingot mold provided by the production method of the ingot mold for ultra-pure special steel can meet the technical requirements of ultra-pure special steel production.