The invention discloses a valve stem chamfering processing device, which comprises a support and a vibrating plate, the vibrating plate is arranged on the support, the vibrating plate is provided with a material outlet, and the support is provided with a feeding mechanism, a fastening mechanism and a grinding mechanism And the receiving mechanism, the fastening mechanism includes a fixed pipe, the grinding mechanism includes a cutting knife for grinding the rough material of the valve stem, the fixed pipe is slidably arranged on the bracket along the vertical direction, and the upper end is arranged at the corresponding position of the cutting knife, The lower end is a free end, and the feeding mechanism includes a conveying column for sending the rough material of the valve stem into the fixed pipe and a conveying arm for sending the material to the conveying column. The conveying column is set under the fixed pipe, and the conveying arm is slidable. Between the fixed pipe and the discharge port, the receiving mechanism includes a receiving hopper and a first driving member for driving the receiving hopper to extend to the lower end of the fixed pipe. Its structure is simple, and it can automatically realize the operation of conveying and loading materials, clamping materials, grinding and processing chamfering, and finally receiving materials, so as to improve production efficiency.