The invention discloses a nodular cast iron planet carrier production method. The nodular cast iron planet carrier production method comprises a smelting iron fluid working procedure, a nodulizing working procedure, an inoculation working procedure and a casting working procedure; after the casting working procedure is finished, when the planet carrier in put into the casting mould, the temperature of T1 is maintained within 790 to 810 DEG C, the planet carrier casting product is taken from the casting mould and the temperature is rapidly reduced; when the temperature T1 of the planet carrier casting product is reduced to the temperature of T2, that is within 490 to 510 DEG C, the planet carrier casting product is hanged into a heat retaining vessel, and then after casting sand is covered on the planet carrier casting product, the thermal retardation is continued; when the temperature T2 of the planet carrier casting product is maintained to the temperature T3, that is within 190 to 210 DEG C, the planet carrier casting product is taken out from the heat retaining vessel and the cleaning work is performed; and finally, the stress removing and annealing working procedure is performed to the planet carrier casting product. The nodular cast iron planet carrier production method has the advantages that the operation is simple, the energy consumption is less, the cost is low, the production cycle is short, the costing product distortion is not easy, and the planet carrier casting product contains pearlyte of more than 80 percent to reach the mechanical property requirements.