The invention discloses a trimming method for a feather trimming device. The method includes the steps of assembling a feather trimming device, feeding materials and trimming, and the feather trimming device comprises a feeding device, a rotating wheel, a trimming chamber and a material receiving barrel, wherein the trimming chamber is conical and the tip of the trimming chamber faces downwards; the rotating wheel is conical and the tip of the rotating wheel faces upwards; the rotating wheel is fixed above the trimming chamber through a rotating shaft, and the rotating shaft is driven by a motor; the circumferential surface of the rotating wheel is provided with an electrostatic adsorption layer connected to an electrostatic generator; the feeding device is in a hyperbolic type, and covers the rotating wheel; the lower opening of the feeding device is higher than the upper brim of the rotating wheel; the inner wall of the upper middle portion of the trimming chamber is movably connected to a trimming box which at least comprises two trimming cases, and the lower opening of the trimming chamber is connected to the material receiving barrel. Compared with the prior art, the feather trimming device has the advantages of being high in trimming efficiency, simple in structure, easy to maintain, and capable of quickly trimming messy feathers and making feather stalks face downwards, and facilitating next operation.