In order to solve the problem of power-carrying operation robot's robotic arm operation in complex environment is susceptible to interference and affect the control accuracy, an super-twisting algorithm global nonsingular terminal sliding mode control (STAGNTSMC) method for the robotic arm of power-carrying operation robot is proposed. The dynamics model of the robotic arm of the power-carrying operation robot is modeled, and a global nonsingular terminal sliding mode function is designed to guide the system trajectory to reach the switching surface from the beginning; the adaptive super-twisting algorithm (STA) is added to the switching control, and the unknown perturbations are estimated by the adaptive method, and the dead-zone technique is used to converge the adaptive law to a stable value. Simulation results show that the method can effectively improve the operation accuracy and response speed of the power-carrying operation robot.