A mechanical de-icing device to remove the ice on quad bundle conductor is proposed. Numerical models of iced transmission lines with the de-icing devices are set up by means of the ABAQUS finite element software, and simulation method of the de-icing process is numerically carried out. The porous elastic constitutive models, in which the temperature and porosity are taken into account, are used to describe the behavior of the ice accreted on conductors, and the tension failure criterion is employed to identify broken ice in the simulation of de-icing process. The user material subroutine VUMAT of ABAQUS software is developed to describe the constitutive relation of the ice and delete the broken elements. Based on the obtained numerical results, the potential of the mechanical de-icing device is demonstrated.