The present invention discloses a solid solution strengthened ferritic nodular cast iron for an automobile steering gear housing. The solution strengthened ferritic nodular cast iron is composed of the following chemical components in percentage by weight: 3.10-3.50% of C, 3.20-3.70% of Si, less than or equal to 0.50% of Mn, less than or equal to 0.05% of P, less than or equal to 0.015% of S, less than or equal to 0.03% of RE, 0.03-0.06% of Mg, and the balance of Fe. A solid solution strengthening production method of the solid solution strengthened ferritic nodular cast iron comprises the processes of electric furnace smelting operation, original melt treatment requirements, an iron liquid treatment method, secondary inoculation, pouring and the like; and after pouring, the iron liquid is subjected to the procedures of sand mulling, core making, molding, sand shakeout, cleaning, checking, protection, warehousing and the like, and then, the satisfactory solid solution strengthened ferritic nodular cast iron for an automobile steering gear housing is obtained. In the production process of the solid solution strengthened ferritic nodular cast iron for an automobile steering gear housing, there is no need to add metals, such as copper, tin and the like, and pearlite alloys, such as ferromanganese and the like; by using a silicon solid solution to strengthen the ferrite and using the solid solution strengthened ferrite to meet demands on the usability and processability of a material, the production cost is reduced, and the demands of both the market and the enterprise are met.