The invention discloses a method for enhancing the carbon dioxide adsorption property of a coal body, and belongs to the technical field of greenhouse gas emission reduction and important coal-fired flue gas pollutant control. According to the method, nitric oxide is utilized for enhancing the carbon dioxide adsorption and storage capacity of the coal body; the characteristic that amidogen and amidogent can be obtained from nitric oxide molecules with high chemical activity and the coal body is sufficiently utilized, on the basis of the electron-donating and electron-accepting acting principle between the amidogen and amidogent and the carbon dioxide molecules, the purpose of enhancing the carbon dioxide adsorption property of the coal body is achieved. The method is beneficial to optimization of the technology of storing carbon dioxide through a deep coal layer, can achieve synergetic storage of important coal-fired flue gas pollutant nitric oxide and greenhouse gas carbon dioxide, and is beneficial to reducing denitration treatment cost of coal-fired flue gas pollutants.