The invention discloses nodular cast iron. The nodular cast iron comprises the following components including by weight, 35-38 parts of carbon, 20-30 parts of silicon, 2-10 parts of manganese, 6-10 parts of calcium, 0.5-1.2 parts of phosphorus, 0.2-0.5 part of sulfur, 3-8 parts of phosphorus, 0.3-0.6 part of magnesium, 0.2-0.5 part of yttrium, 0.1-0.5 part of rhenium and the balance pig iron. Thenodular cast iron disclosed by the invention reduces the occurrence rate of shrinkage loosing and shrinkage porosity of a cast part and effectively reduces generation of defects, and thus the mechanical properties and the production efficiency of the cast part are improved.