The present invention relates to the field of cosmetics, particularly to skin care water and a preparation method thereof, wherein the skin care water contains a pearl extract, a yeast cell lysate extract, a psidium guajava linn fruit extract, and sodium hyaluronate. According to the present invention, the cosmetic composition uses a variety of naturally-derived ingredients as the main active ingredients; and the skin care water can timely replenish water and maintain long-term moisturizing so as to make the skin appear the moist state, can promote cell respiration, improve cell oxygen consumption rate, promote cell metabolism and reduce oxidative stress, and can effectively clear free radicals and reactive oxygen and repair damaged skin so as to protect the skin, wherein various components are rationally combined, synergistically act, are safe and stable, can moisturize, and form the cosmetic product for supplying energy for the skin.