The invention discloses a traction device for a transformer. The winding outgoing line traction device for the transformer comprises a traction rope and a connection element which is connected with the traction rope, and the connection element is provided with a first close nipple. A thread middle element is connected with the connection element and is provided with a first screwed joint and a second screwed joint, and the first screwed joint corresponds to the first close nipple. A first insulating sleeve is installed outside the connection element, connected with the thread middle element through the first close nipple and connected with a lead traction head through the second screwed joint. A winding outgoing line can be conveniently dragged out of a hollow channel of a high-pressure casing through the traction rope, so that the transformer winding outgoing line is easy to assemble, and transformer winding assembly efficiency is improved.