The utility model discloses a broaching tool of cone hole internal keyways, wherein the broaching tool comprises a locating sleeve and a guide sleeve. An axial locating end face and an outer cylindrical locating face are arranged on the locating sleeve. The rear section of the guide sleeve is arranged in the locating sleeve. A limiting counter bore is formed at the front end of an inner hole of the locating sleeve. A locating shaft shoulder which is matched with the limiting counter bore is arranged in the middle of the guide sleeve. A cone section which is matched with a cone hole of a workpiece is arranged at the front section of the guide sleeve. The axis of the cone section is crossed with the axis of the outer cylindrical locating face of the locating sleeve, and the included angle between the two axes is equal to the included angle between a bus of the cone hole of the workpiece and the axis of the cone hole. A broach limiting groove which is communicated along the axis direction of the guide sleeve is formed in the guide sleeve. According to the broaching tool of the cone hole internal keyways, the workpiece is located through the cone section on the guide sleeve, and the internal keyways of the workpiece are axially parallel to the locating sleeve, so that a broach is parallel to the internal keyways. The broaching tool of the cone hole internal keyways achieves mass machining of the cone hole internal keyways on a broaching machine, and can ensure accuracy of the internal keyways.