NOVELTY - A Beauveria bassiana extract preparation method involves selecting Beauveria bassiana sp. Strain, which is Beauveria brongniartii, or polymorphic Beauveria amorpha. The strain is cultivated in surface seed culture to fungi strain preservation of culture medium to obtain first grade strain. The obtained first grade strain is cultivated in a liquid shaking culture medium. Concentrated solution is treated with ethanol and precipitated to obtain concentrated alcohol liquid followed by recycling with ethanol, concentrating and purifying to obtain product.    USE - Method for preparing Beauveria bassiana extract (claimed) having whitening and anti-aging activity, and for reducing inflammation.    ADVANTAGE - The method enables preparing Beauveria bassiana extract with high antioxidant effect, in a easy, environmently friendly and cost effective manner.    DETAILED DESCRIPTION - A Beauveria bassiana extract preparation method involves selecting Beauveria bassiana sp. Strain, which is Beauveria bassiana or Beauveria brongniartii, or polymorphic Beauveria amorpha. The strain is cultivated in surface seed culture to fungi strain preservation of culture medium at 20-30 degrees C and culturing for 4-7 days to obtain first grade strain. The obtained first grade strain is cultivated in a liquid shaking culture medium comprising glucose (40 g/l), peptone (10 g/l), yeast leaching powder (10 g/l) of constant volume distillation. The liquid culture medium (30-50%) is added in a 100 ml triangular flask inoculating 1-3 inclined plane strain, in the full temperature shaking incubator, at 20-30 degrees C, the rotating speed of 100-200 rpm, and culturing for 3- 7days to obtain the secondary strain. The obtained second-level strain is inoculated into a 10 l fermentation tank containing liquid content of 50% , where the tank contains volume of 70%, the inoculation quantity of 5-10%, air flow volume ratio of 1:1, the pressure of 0. 1MP.The tank is kept at 20-30 degrees C for 2-5 days to obtain the strain. Third level strain is cultured in a medium with the liquid culture base, and passed into 100 l fermentation tank, initially liquid carrying quantity of the fermenting tank is 50-70 vol.%, the inoculation quantity is 5-10%, the ventilation volume is 1:1, the pressure is 20-30 degrees C for 5-15 days , to obtain the fermentation product in a fermentation tank culture medium with the second grade seed cultivation group. The fermentation product is extracted, refined and pre-processed. The product is rotated at speed of more than 1000 rpm/minute, at below 100 degrees C, centrifuged and filtered to obtain clear liquid followed by concentrating to obtain the concentrated liquid. The concentrated solution is treated with 1-4 volume ratio of ethanol and precipitated at 0-40 degrees C, and then the rotated at a speed of more than 1000 rpm/minute and centrifuged at less than 100 degrees C to remove the filtrate, to obtain concentrated alcohol liquid (1/2-1/10), followed by recycling with ethanol, concentrating the alcohol solvent according to the volume ratio of 1: 0.5: 5, adding, the soap such as petroleum ether, hexane or light petrol to the liquid. The liquid is mixed uniformly and extracted, and upper layer-lower layer water phase of the liquid is removed, at less than 100 degrees C to obtain 1/2-1/10 times concentrated solution. The concentrated solution is primarily purified, and the impurities are removed according to volume ratio of 1: 0.5-5. The purified mixture is added with extracting agent such as butanol, and/or ethyl acetate at a volume ratio of 2-0.5:0.5-2. The water layer-organic phase is removed from the extracted mixture, and concentrated at not more than 170 degrees C under the condition of drying, to obtain crude product with the characteristic of light yellow to brown amorphous powder. The crude product comprises white muscardine fungus, bauveriaoside (5-15%), white muscardine fungi ketone (5-15%), monosaccharide and disaccharide (5-20%), sterol compound (1-5%), nucleoside (5-15%), and other active ingredient (69- 30%). The crude product is refined by separating and purifying by chromatography technique comprising the bonding phase as fixed phase, using ethanol or methanol and water according to 0-100:100-0 to carry out gradient elution, eluting volume of the chromatographic column is 50-200 times, where the bonded phase filler comprises inverting octadeca-carbon filler such as RPC18, and the particle diameter of 5-50 microns. The active eluate is collected, concentrated at below 100 degrees C, and dried at less than 170 degrees C to obtain the product in form of white or light red brown powder. The product comprises bauveriaoside, preferably 2-(4,5-dihydroxy-2-methyl-phenoxy)-6-hydroxymethyl-5-methoxy-tetrahydro-pyran-3,4-diol (80-99%), white muscardine fungi ketone (4- 0.1%), monosaccharide and disaccharide (3-0.1%), alcohol compound (2-0.1%), nucleoside (3-0.1%), and other content (8-0.6%).