The invention discloses a portable high-voltage grounding line operating device, and the device comprises a grounding clamp, an insulating rod, and an insulating handle. The device also comprises a core rod and a press block assembly. The insulating rod and the insulating handle are in rotating connection. The core rod is disposed in a central axle hole of the insulating rod in a sleeved manner. The front end of the core rod is in butt joint with a press block, and the tail end of the core rod is provided with a threaded rod. An inner side of the insulating handle is provided with a threaded tube. The threaded rod at the tail end of the core rod is connected with the threaded tube in the handle. According to the device provided by the invention, an operating rod has a movable part and a fixed part, and the movable part and the fixed part can relatively rotate so as to enable an aluminum grounding clamp and an aluminum grounding clamping head to clamp a bus. There is no need of a frictional force between the grounding clamp and the bus for assisting the clamping. The operation is very convenient and safe, and a grounding device does not need to press the bus during operation, so there is no damage caused to the bus.