The invention discloses an efficient continuous carbon dioxide collection material and a preparation method. Effective ingredients of the collection material are a nano-porous material and sodium carbonate loaded on the nano-porous material. The appearance of the collection material is the appearance of the selected nano-porous material or is of various film-like or blocky structures made of the nano-porous material. The preparation method comprises the steps that firstly, the nano-porous material with the pore diameter small than 500 nm is selected; next, the nano-porous material is soaked in a 1mol/L sodium carbonate solution for 2-3 hours, then normal-temperature drying treatment is carried out, and the nano-porous material loaded with sodium carbonate can be obtained. The material can be used for cyclically adsorbing and collecting carbon dioxide simply by changing humidity; the nano-porous material has a developed pore structure and can display some characteristics opposite to those under macroscopic conditions when a chemical reaction is restricted in a nano-hole, and cyclical collection of carbon dioxide is realized by fully utilizing the peculiarity; preparation raw materials are low in cost, and meanwhile the cyclical adsorption process is carried out under normal temperature and can be realized simply by changing the humidity and relying on solar energy.