Replacing structure of tackle of resistance welding machine

The invention discloses a replacing structure of a tackle of a resistance welding machine. A welding beam is arranged on a rack, a welding head is arranged on the welding beam, sliding rails are arranged below the welding beam, the tackle is supported on the sliding rails, steel wires to be welded are distributed on the tackle, sliding components are respectively arranged on two sides of the tackle, an auxiliary sliding rail is arranged outside each siding rail on the outermost side of the rack, the auxiliary sliding rails are matched with the sliding components, and each auxiliary sliding rail is supported on the rack through at least two telescopic rods. The tackle passes in and out a connecting working position from an identical side through the lifting and the inclining of the auxiliary sliding rails, an occupied area is effectively reduced, an operator can complete all work by standing on one position, an operation saves time and labor, and working efficiency is improved.