The invention discloses a method for detecting the feather degradation rate, and belongs to the technical field of feather degradation rate detection methods. The method comprises the following steps:drying a nylon bag to a constant weight, weighing the weight of the nylon bag, and recording the weight as M1; cleaning feathers, drying the feathers, crushing the feathers, and sieving the crushed feathers to obtain feather powder; weighing the feather powder, placing the feather powder in the nylon bag, sealing the nylon bag, drying the nylon bag containing the feather powder to a constant weight, weighing the weight, and recording the weight as M2; immersing the nylon bag in a liquid medium, inoculating the liquid medium with a bacterial liquid, performing fermentation, taking out the nylon bag after the fermentation, adding distilled water to immerse the nylon bag, placing a container in a water bath shaker, performing cleaning, repeating above steps multiple times, drying the cleanednylon bag, weighing the weight of the nylon bag, and recording the weight as M3; and calculating the feather degradation rate according to a formula. The method has the advantages of accuracy in thedetection result of the feather degradation rate, good parallelism and repeatability, simplicity in operation, and high detection efficiency, is suitable for evaluating the ability of microorganisms to degrade feathers, or is used for studying the degradation of feathers by the microorganisms.