The invention relates to a high-voltage electric connection device. The device comprises a connection bolt used for connecting an electrode rod, a flexible conductor, a conical heavy hammer, a funnel-shaped connector, a connection flat iron, a connection rod, and other fastening parts. According to the invention, the direction and position of the funnel-shaped connector is adjusted through the connection flat iron, such that the funnel-shaped connector is positioned right below a mounting hole of the electrode rod. When the conical heavy hammer is placed into a tank from the electrode rod mounting hole, the conical heavy hammer can just fall into the funnel-shaped connector, such that high-voltage electricity can be transmitted into the tank through the electrode rod.