The invention provides a precision die chamfering jig. The precision die chamfering jig comprises a device main body, a repelling mechanism and a shielding mechanism. The device main body comprises asupport rod I, a bottom plate, a trapezoidal steel plate I, die edges, a trapezoidal steel plate II and a support rod II. The repelling mechanism comprises a cylinder body, a magnetic block, a spring,an iron block, a connecting rod, an end cover, a universal ball and a rubber plate. The shielding mechanism comprises a limiting plate I, a switch, a torque spring, a rotating shaft I, an electromagnet, a baffle, a rotating shaft II, a limiting plate II and a triangular plate. Compared with the prior art, the precision die chamfering jig has the following beneficial effects of achieving the functions of repelling and impact resisting as well as the function of shielding and spark splashing preventing.