The embodiment of the utility model provides a mounting support of an electric power overhaul robot. The device comprises a bottom frame, an X-axis sliding rail, a Y-axis sliding rail and a base usedfor installing the electric power overhaul robot. The X-axis sliding rail is connected with the bottom frame. The Y-axis sliding rail is connected to the X-axis sliding rail in a sliding mode. The base is connected to the Y-axis sliding rail in a sliding mode. A first control mechanism is arranged on the X-axis sliding rail; the base is provided with an X-axis sliding rail and a Y-axis sliding rail, the Y-axis sliding rail is controlled by the first control mechanism to reciprocate along the X-axis sliding rail, a second control mechanism is arranged on the Y-axis sliding rail, the base is controlled by the second control mechanism to reciprocate along the Y-axis sliding rail, and height-adjustable supporting legs are arranged at the bottom of the bottom frame. The device is simple in structure and low in cost. The position of the robot can be conveniently adjusted, meanwhile, it is guaranteed that the robot is located on the same horizontal plane in work, and maintenance precision isimproved.