The invention discloses a power earthing device. The power earthing device comprises a hollow earthing pile. A spiral twist drill is arranged at one end of the hollow earthing pile. Multiple arc-shaped barbs are arranged on a pile body of the hollow earthing pile. The rotating direction of the arc-shaped barbs is the same as that of the spiral twist drill, and barb tips of the arc-shaped barbs are opposite to a drill tip of the spiral twist drill. As the spiral twist drill is arranged at one end of the hollow earthing pile, much labor is saved when the pile body is driven underground; as the arc-shaped barbs are arranged on the pile body of the hollow earthing pile and the rotating extension direction of the arc-shaped barbs is the same as the rotating direction of the spiral twist drill, the resistance of the whole pile body during reverse pulling-out can be enhanced while the drilling installation effect of the hollow earthing pile is not affected, a very excellent antitheft effect is achieved, the contact area between the pile body and soil is increased through the arc-shaped barbs, and the conductivity of the hollow earthing pile is better.