NOVELTY - Preparing nodular cast iron involves selecting raw material such as coke with carbon content ( not less than 85%), sulfur content ( not greater than 0.50%), water content ( not greater than 3%), carbon content of iron ( 4.2-4.3%), silicon (0.9-1.1%), phosphorus content ( not greater than 0.040%), sulfur content ( not greater than 0.020%), scrap steel, which contains low-quality carbon-manganese steel with carbon content less than or equal to 0.5% and manganese ( not greater than 0.3%).    USE - Method for preparing nodular cast iron (claimed) used in generating wind power, nuclear power, and in making rail tracks.    ADVANTAGE - The method enables to prepare nodular cast iron that imparts toughness to the rail track material.    DETAILED DESCRIPTION - Preparing nodular cast iron involves selecting raw material such as coke with carbon content ( not less than 85%), sulfur content ( not greater than 0.50%), water content ( not greater than 3%), carbon content of iron ( 4.2-4.3%), silicon (0.9-1.1%), phosphorus content ( not greater than 0.040%), sulfur content ( not greater than 0.020%), scrap steel, which contains low-quality carbon-manganese steel with carbon content less than or equal to 0.5% and manganese ( not greater than 0.3%). The obtained mixture is placed in a cupola furnace at not greater than 1450 degrees C to obtain molten mixture, where the final weight of molten-iron liquid mixture is carbon (3.3-3.6%), silicon (1.8-2.2%), manganese ( not greater than 0.20%), phosphorus ( not greater than 0.040%), sulfur ( not greater than 0.020%), rhenium (0.030-0.040%), magnesium and (0.040-0.055%). The processed mixture is spheroidized to which nodulizer e.g. magnesium ferrosilicon alloy is added. The spheroidized mixture is then processed in a stream inoculation treatment device at not less than 1380 degrees C. The processed product is casted into a mold, where the obtained mold product is incubated in a box for 21-36 hours, and again processed in a furnace at 500-550 degrees C for 203 hours. The desired product is cooled such that the temperature of the heated material reaches to 200 degrees C.