The invention discloses a die casting method for a die-casting fitting. The die casting method comprises the following steps that firstly, whether a die casting die is in a good condition or not is checked, and lubricant is sprayed into a die cavity of the die casting die; secondly, molten iron is injected into the die casting die; and thirdly, after the molten iron is solidified, a rudiment in the die casting die is pushed out through a push rod. The defective rate of the die-casting fitting die-cast through the die casting method is low, and therefore subsequent machining cost is reduced.