The invention relates to Prussian-blue spherical pigments for cosmetics and a preparation method thereof, which relate to the technical field of refined chemical materials. A spherical base material with an average particle size D50 of 1 to 50 micrometers is taken as a pigment base material, and the surface of the base material is at least coated with SnO2, Al2O3 and Fe4[Fe(CN)6]3 metal oxide coatings. The preparation method comprises the following steps: first placing the base material into ionized water to prepare a suspension, adding a SnCl4 solution, a AlCl3 solution, a FeCl3 solution and a K4Fe(CN)6 solution into the suspension, when the color of the suspension reaches a needed hue, continuously stirring at constant temperature, then filtering the suspension, drying, and calcining. Compared with the prior art, the preparation method is simple, the coating of the prepared product is uneasy to drop, and the prepared product has the effects of subdued light effect, good skin feeling, and low oil absorption.