Method for producing L-phenylalanine by using bacillus subtilis to ferment feather

The invention discloses a method for preparing L-phenylalanine utilizing bacillus subtilis fermentation feather comprising steps mixing abandoning feather, common salt, magnesium chloride, calcii chloridum, patassium dihydrogen phosphate, dibasic potassium phosphate and yeast powder in proportion, solving by purified water and sterilizing by heat treating, then transferring bacillus subtilis YYW-1 CGMCC NO.2396, fermenting at 35-40 DEG C for 48-72 hours, acid-conditioning the fermentation outcome, absorbing and cleaning by 732 ammonium -type cationic ion-exchange resin to obtain L-phenylalanine concentrated solution. In the method, the raw material cost is low and the wasted is utilized in high value, furthermore, the prepared L-phenylalanine has high optical purity and good quality and can satisfy the need of industry and medicine industry.