The invention relates to a feather stem trimmer. The feather stem trimmer comprises a taper seat, wherein a storage rack is arranged inside the taper seat along a longitudinal direction in a sliding manner and is connected to a motor; a storage space is formed in the upper end of the storage rack; the lower end surface of the storage space is a hemisphere surface; four openings are formed in the upper part of the taper seat; a falling channel is formed in the external circular arc end surface of the lower part of the taper seat; a small clamping opening is formed in the lower end of the falling channel; an annular ring is arranged at the lower part of the small clamping opening; cutting knives are uniformly distributed on the inner circular arc surface of the circular ring; a round of straight teeth are arranged on the external circular arc surface of the circular ring and are meshed with a gear; and the gear is connected to a motor. The feather stem trimmer is simple to operate, can automatically branch and transport leathers, can drive the annular ring to rotate in a gear teeth transmission manner, achieves the effect of automatically trimming stems of a plurality of leathers at a time and has high trimming efficiency.