A disposable chamfering blade (10) is provided with a mounting hole (11) through which the disposable chamfering blade (10) can be locked to a cutter body (20). One end of the disposable chamfering blade (10) is provided with a conical cutter head (12) whose conical periphery is circumferentially provided with a plurality of chip removing grooves (13). Each chip removing groove (13) has a side face formed as a cutting edge (14) such that the disposable chamfering blade (10) is formed with a plurality of cutting edges (14) for continuous cutting.