The invention provides a preparation method of camellia extraction liquid. The method comprises the following steps of 1) removing impurities of fresh camellia and / or fresh camellia buds;
cutting up the fresh camellia and / or fresh camellia buds into small sections for use as raw materials; 2) taking a certain number of raw materials; putting the raw materials into an ultrasonic kettle; adding a
solvent with the
mass ratio being 1:(3-30); uniformly stirring the mixture; adding a certain amount of inorganic acid and / or
organic acid; regulating the pH value to 1.3 to 3.0; soaking the materials for 10 to 30 min; 3) then performing ultrasonic treatment for 30 to 60min; controlling the ultrasonic frequency to be 20 to 25KHz, the ultrasonic power to be 1.0 to 2.0KW and the ultrasonic temperature to be 15 to 50 DEG C; then performing
filtration, sterilization and detection to obtain camellia extraction liquid. The camellia extraction liquid maintains the color, luster,
flavor and effective active ingredients of the camellia to the maximum degree; the anti-oxidation functional ingredients are overall; the contents are high; the safety and the stability are high;
cosmetics prepared by using camellia extraction liquid as active ingredients have the excellent whitening, spot-reducing and anti-aging efficacies.