The utility model discloses a special clamp. The clamp comprises a chuck, connection sheets and handles. The chuck and the handles are connected and form panels. A central section of the each panel is provided with the each connection sheet. Two symmetrical panels are hinged with each other through the connection sheets. Bottom parts of the two symmetrical panels are bended towards a same direction so as to form the handles. A spring is arranged below the connection sheets and is used to connect the two handles. The spring is a pressure spring which is made of steel wires through rolling. And the spring is a spring piece. The special clamp of the utility model is used as a special tool in glue line fixing and bonding processes of a transformer. An extrusion force is applied to the gummed transformer glue line so that glue line bonding is guaranteed not to be shifted and there is no gap. Sealing is good and operation is convenient.