Natural plant extract and preparation method thereof, as well as application of natural plant extract in preparation of products with whitening and spot fading effects

The invention relates to the technical field of natural product chemistry, and particularly discloses natural plant extract and a preparation method thereof, as well as application of the natural plant extract in preparation of products with whitening and spot fading effects. The preparation method of the natural plant extract comprises the following steps: (1) mixing trifolium pretense and English walnut leaves, and then carrying out heating reflux extraction for 3-6 hours by using ethanol with the volume fraction of 40-60%; subjecting the extracting solution to concentrating and drying to obtain ethanol extract; and (2) loading the ethanol extract on a silica gel column, then carrying out eluting with a mixed solvent composed of cyclohexane and ethyl acetate, collecting eluent, and carrying out concentrating and drying to obtain the natural plant extract. Researches show that the natural plant extract prepared by the method disclosed by the invention has excellent tyrosinase-inhibiting activity; and the nat