The invention discloses a method for producing mixed matrix structure as-cast spheroidal graphite cast iron. A proper smelting technology and proper chemical components are selected for control, wherein an intermediate frequency furnace is used in molten iron smelting for single smelting, and a pig iron and scrap steel recarburization technology is adopted for producing base iron; a sandwich type package is used in a ladle, and the mass percents of Si, Mn, Cu, Ca and Ba in a casting are controlled; and after casting forming is conducted, high-temperature box opening is conducted. By the adoption of the method, the content range of pearlite ranges from 55% to 75%, the content of ferrite ranges from 25% to 45%, the content of cementite is zero, iron phosphide eutectic is in the first level, the graphite spheroidal rate reaches the second level, and the graphite sphere size is in the sixth level. According to the mechanical performance of a casting body of the mixed matrix structure as-cast spheroidal graphite cast iron, the tensile strength of the casting body can be larger than or equal to 600 Mpa, the ductility of the casting body is larger than or equal to 10%, the impact toughness of the casting body is larger than or equal to 25 J/cm<2>, the hardness HB of the casting body ranges from 180-250, and iron is used for replacing steel. In addition, technological processes are simple, control is easy, and the cost is reduced.