The invention discloses a gear chamfering machine comprising a lathe bed. An oblique lathe bed is fixedly connected to one side of the upper surface of the lathe bed, and a workpiece main shaft box is fixedly connected to the other side of the upper surface of the lathe bed. A Z-direction sliding rail is fixedly connected to the oblique lathe bed, a Z-direction sliding plate is arranged on the Z-direction sliding rail, and an X-direction sliding rail is perpendicularly connected to the Z-direction sliding plate. An X-direction sliding plate is slidably connected to the X-direction sliding rail, and a tool mechanism is fixedly connected to the X-direction sliding plate. According to the specific structure of the tool mechanism, a Y-direction sliding plate capable of linearly moving in the Y-axis direction of a tool vertical column is mounted on the tool vertical column, and a tool box clamping a tool rod is mounted on the Y-direction sliding plate. According to the gear chamfering machine, the machining accuracy can be improved, the machining quality is ensured, the consistency is good, and cut objects are collected advantageously.