The invention discloses a chamfering device of a hardware die, and belongs to the technical field of hardware dies. The chamfering device comprises a shell, a bearing plate, a limiting component, a chamfering component, a waste recycling component, a lubricating component and four supporting legs, wherein the shell is of a cavity structure, the four supporting legs are distributed at the bottom end of the shell in a rectangular mode, the two ends of the bearing plate are in threaded connection with the side wall of the shell correspondingly, four supporting columns are distributed on the bearing plate in a rectangular manner, the top ends of the four supporting columns are fixedly connected with the top end of the shell, the limiting component is arranged on the bearing plate, the chamfering component is arranged in the shell, and the waste recycling component and the lubricating component are both arranged at the top end of the shell. According to the chamfering device, the chamfer angle can not be adjusted according to actual conditions, the chamfering efficiency is influenced, so that the abrasion of a cutter head is relatively high, and the service life of the cutter head is reduced.