Plant skin-whitening cosmetics based on Tibetan synotis erythropappa and preparation method thereof

The invention provides plant skin-whitening cosmetics based on Tibetan synotis erythropappa and a preparation method thereof. The plant skin-whitening cosmetics are prepared from Tibetan synotis erythropappa, herbal rhodiolae, snow saussurea flowers, aloe gel, nicotinamide, olive oil, tea polyphenol and deionized water. The method specifically comprises the steps that 1, by weight, 1 part of Tibetan synotis erythropappa, 1 part of herbal rhodiolae and 1 part of snow saussurea flowers are respectively dried, smashed, added into 10-15 parts of solvent and subjected to extraction refluxing 2-3 times for 1 hour each time, and extracting solutions are combined and concentrated to obtain Tibetan synotis erythropappa extract, herbal rhodiolae extract and snow saussurea flower extract respectively; 2, the herbal rhodiolae extract and the snow saussurea flower extract are added into the Tibetan synotis erythropappa extract, the mixture is slowly stirred to be mixed uniformly, and then a skin-whitening functional agent is obtained; 3, the skin-whitening functional agent is heated and stirred for 5-10 min, aloe gel, nicotinamide, olive oil, tea polyphenol and deionized water are added into the skin-whitening functional agent, the mixture continues to be stirred, the temperature is dropped to room temperature, and then the plant skin-whitening cosmetics based on Tibetan synotis erythropappa are obtained.