A cosmetic composition for whitening skin and a preparation method thereof The composition comprises the following components: pearl powder, pearl extract, glycyrrhiza glabra aqueous solution, hydrolyzed conchiolin protein and pea extract. The contents of the pearl powder and the pearl extract are not both zero, and the glycyrrhiza glabra aqueous solution contains 0.5 to 5.0% of the glycyrrhiza glabra extract.
