Chamfering sleeve

The utility model discloses a chamfering sleeve which comprises a body, a connecting hole is formed in the body in the length extending direction, the connecting hole is used for being connected with an external drill bit in a sleeved mode, at least two chamfering blades and at least two chip grooves are arranged at one end of the body, and the chamfering blades and the chip grooves are alternately arranged along the periphery of the body. A common drill bit is sleeved with the chamfering sleeve, the common drill bit can be changed into a secondary drill bit, drilling and chamfering can be carried out at the same time, and use is convenient; the position of the chamfering sleeve connected to the drill bit in a sleeving mode can be adjusted according to the depth of a hole needing to be machined, and applicability is good; besides, chamfering sleeves with different sizes and shapes can be replaced according to the sizes or shapes of chamfers needing to be machined, so that the universality is better; and durin