The invention relates to a method for quickly forecasting an interlayer spacing of layered double hydroxides based on atomic parameters. The method comprises the following steps of 1) collecting a plurality of known layered double hydroxides and the interlayer spacing of the layered double hydroxides; 2) collecting the atomic parameters of metal atoms in the layered double hydroxides in combination with a periodic table of elements; 3) taking the metal atomic parameters as independent variables, taking the interlayer spacing as a dependent variable, and building a quick forecast model for the interlayer spacing of the layered double hydroxides by adopting an artificial neural network algorithm; and 4) quickly forecasting the interlayer spacing of the layered double hydroxides according to the built quick forecast model for the interlayer spacing of the layered double hydroxides and atomic parameter data of to-be-detected new layered double hydroxides. The method has the advantages that the forecast is simple, convenient and quick, the cost is low, a sample is not destroyed, the environment is not polluted and the like.