In the complex electromagnetic environment of the transmission line, a large number of electromagnetic sensitive components in the control system of the live working robot cannot work stably and reliably. Therefore, aiming at this problem, this paper takes the 110kV transmission line live working robot as the research object, and conducts electromagnetic analysis and protection design for it. According to the three elements of electromagnetic interference, a solution to the electromagnetic protection of live-line working robots is proposed. In order to realize the live working of the robot, the equipotential mode is selected as the working mode of the robot, and the feasibility of the equipotential mode is verified through experiments.