The invention relates to a method of transferring a contact suspension for additionally building an open-
cut tunnel on an electrified railway operating line. The method includes the steps of: building a section of open-
cut tunnel foundation and two pieces of sidewalls close to a to-be-dismantled
contact network supporting column; then vertically arranging an arch-shaped steel
pipe bracket between the two sidewalls; transferring a contact suspension on the
contact network supporting column onto the steel
pipe bracket; constructing a whole open-
cut tunnel after dismantling the
contact network supporting column; and finally transferring the contact suspension onto an arch
buttress bracket and dismantling the steel
pipe bracket, etc. In the method provided by the invention, the arch-shaped steel pipe bracket as the device for transferring the contact suspension is vertically arranged in the open-cut
tunnel under construction, in this way, not only the contradiction occurred due to the traditional contact network supporting column occupying the building site of an open-cut tunnel can be solved, but also the time for locking out a
railway line is shortened maximally, so that the influence on the normal operation of electric locomotives is minimum, and at the same time, the construction of an arch ring of the open-cut tunnel can be continued. In addition, the safety of constructors is guaranteed due to a grounding wire laid on the steel pipe bracket.