The invention discloses a method for producing cubic nano calcium carbonate. The method comprises the following steps: 1) calcining limestone and coke in a shaft kiln so as to obtain calcium oxide andkiln gas; 2) preparing a 5wt%-15wt% calcium hydroxide suspension from the purified kiln gas; 3) performing two-stage carbonization by using a super-gravity reactor, and aging; 4) performing modification at 40-80 DEG C; and 5) filtering, drying, crushing, and grading, thereby obtaining cubic nano calcium carbonate. The production method disclosed by the invention is high in production efficiency and low in cost, the raw materials are readily available, continuous production of nano calcium carbonate is achieved by using the production method, and meanwhile, cubic nano calcium carbonate which is narrow in particle size distribution and stable in form and quality with the particle size of 10-80nm can be prepared without aids such as a crystal form control agent in the production process.