The utility model relates to a hand-held tube orifice chamfering machine used for pipe chamfering. The chamfering machine is composed of a main shaft, a cantilevered frame, a driving motor provided with an emery plate, a hand feeding mechanism and a manual expanding inside tightly rising device. The utility model can be conveniently fixed on a tube orifice and finishes the task of cutting the chamfering for the tube orifice. The chamfering machine is simple in structure, convenient to carry and convenient in operation. The quality of tube orifice chamfering can be ensured because of the operation of the chamfering machine, accordingly, the welding quality of the butt joint of the tube orifice is improved. The work efficiency can be improved and the labor intensity can be reduced. The chamfering machine is applicable to the construction of various pipelines.