The invention relates to the technical field of fire stopping collar machining equipment, and particularly discloses a fire stopping collar core material forming die. The fire stopping collar core material forming die comprises a male die, a female die, a stripper die, a die core and a connecting flange, wherein one end of the die core is fixed in the center of the connecting flange; the female die sleeves the die core and one end of the female die is fixed with the connecting flange; a die cavity capable of pressing out a fire stopping collar core material is formed between the die core and the female die; connecting legs which are spaced from one another are arranged at one end of the stripper die; the stripper die is inserted in the die cavity and the connecting legs of the stripper die penetrate through the connecting flange to be connected with a stripper die connecting plate; one end of the male die is connected with a male die connecting plate; and the other end of the male die can be inserted in the die cavity and is in sliding fit with the die cavity. Edge chipping, corner chipping and the like of a fire stopping collar core material produced by the die disclosed by the invention are not caused easily, the forming quality is high, and the fire stopping collar core material can be conveniently assembled with a fire stopping collar main body in the later period.