The invention relates to a polymer based dielectric material with ceramic lamellar crystal orientation distribution and a preparation method thereof. The method comprises the steps of subjecting ceramic powder to surface amination, then, subjecting resin microspheres to surface sulfonation, mixing surface-sulfonated polymer microspheres with deionized water, then, adding the aminated ceramic powder, carrying out stirring, dropwise adding a glutaraldehyde solution, carrying out heat preservation and washing, then, carrying out drying so as to obtain composite powder, putting the composite powder into a die, and carrying out hot-press forming, thereby obtaining the polymer based dielectric material with ceramic lamellar crystal orientation distribution. Compared with the prior art, the method has the advantages that surfaces of polymer microspheres are coated with lamellar ceramic powder to form polymer microsphere/ceramic lamellar crystal composite powder with a core-shell structure; the orientated distribution of the lamellar ceramic powder in a composite material is achieved by a torsional force generated on the lamellar composite powder by the melted deformation of the polymer microspheres during forming; the dielectric constant of the composite material is increased substantially; and then, the dielectric energy storage density of the composite material is improved, so thatmaterial and technical supports are provided for the development of miniaturized dielectric energy storage devices.