A preparation method for a camellia extraction liquid comprises the following steps: 1) removing impurities of fresh camellia and/or fresh camellia buds cutting the fresh camellia and/or fresh camellia buds into small sections for use as raw materials 2) placing a certain quantity of raw materials into an ultrasonic vessel adding a solvent having 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 min to 30 min and 3) then performing ultrasonic treatment for 30 min to 60 min controlling the ultrasonic frequency to be 20 KHz to 25 KHz, the ultrasonic power to be 1.0 KW to 2.0KW and the ultrasonic temperature to be 15℃ to 50℃ 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, and the anti-oxidation functional ingredients has high contents, and are safe and stable cosmetics prepared by using camellia extraction liquid as active ingredients have excellent whitening, spot-reducing and anti-aging efficacies.La méthode de préparation dun liquide dextraction de camélia comprend les étapes suivantes : 1) élimination des impuretés de camélia frais et/ou de bourgeons de camélia frais découpe des bourgeons de camélia frais et/ou de camélia frais en petites sections destinées à être utilisées en tant que matières premières 2) placer une certaine quantité de matières premières dans un récipient à ultrasons ajouter un solvant dont le rapport de masse est de 1:(3-30) agiter uniformément le mélange ajouter une certaine quantité dacide inorganique ou organique réguler la valeur du pH entre 1,3 et 3,0 tremper les matériaux de 10 à 30 minutes et 3) faire un traitement par ultrasons pendant 30 min à 60 minutes. La fréqu
