The clamp is used for connecting power transformer, post switch, vacuum circuit breaker and high voltage electric round bar connection pile head to conductor, bus bar and terminal. The design principle of screw sleeve and side slit is adopted at the end of the clamping rod. When the clamp is installed on the conductive rod of the equipment, the screw on both sides of the tightening slit has the advantages of large electrical contact area, close and firm contact. On the other side, the clamping rod is connected with the bus bar, wire and connection terminal in different ways, such as pressing plate, flat plate and circular pipe.