The invention discloses application of bacillus pumilus on the aspect of producing keratinase and crude enzyme property of the bacillus pumilus, and belongs to the technical field of microbes. The strain is identified as Bacillus pumilus, named K9 and is collected in CGMCC (China General Microbiological Culture Collection Center), and the collection register number of the Bacillus pumilus is CGMCC No.8046. The method for producing the keratinase by optimizing the strain is characterized in that the following materials in percentage by weight are adopted: 1%-3% of wool, 1%-2% of maltose, 1%-2% of yeast powder, 0.04% of dipotassium hydrogen phosphate and 0.05% of sodium chloride; the culture condition is as follows: an initial pH value is 8.5, the inoculation amount is 8%, the culture temperature is 35 DEG C, the rotation speed is 220 r/minute, the liquid loading capacity is 25 ml/250 ml, the fermentation period is 48 hours, and the activity of the produced keratinase achieves 214.5 U/ml; the keratinase is a medium-temperature alkaline keratinase, the optimum operative temperature is 55-65 DEG C, and the optimum pH is 9.0. The strain is fast in growth and higher in keratinase production capacity; the produced keratinase is stable in enzyme activity in an alkaline (pH=8.0-11.0) environment.