The invention discloses a preparation method for reducing 
down feather loss rate. The method includes the steps: removing impurities in raw 
down feather, washing and 
drying the raw 
down feather, adding nano-silver, uniformly mixing mixture, and treating the mixture by microwaves to obtain a pre-
prepared material a; mixing 
ferric chloride hexahydrate, 
ferrous chloride tetrhydrate and water, heatingand stirring mixture, adding 
ammonium hydroxide to uniformly stir mixture, adding 
humic acid, adjusting temperature to stir mixture, adding stone needle 
powder to stir mixture, centrifuging the mixture, removing upper solution, 
drying a lower 
solid material, and crushing the 
solid material to obtain a pre-
prepared material b; mixing the pre-
prepared material a, the pre-prepared material b, composite biological enzymes, rose 
essential oil, 
surface active agents and water, and heating, stirring, filtering, washing and 
drying mixture to obtain high-whiteness down 
feather. According to the method, on one hand, the 
fiber strength of the prepared down 
feather can be enhanced, the is reduced, on the other hand, adhesion among down 
feather protein fibers can be effectively avoided, bulkiness of the prepared down feather is effectively maintained, and deodorization and sterilization effects are good.