The invention relates to electric soldering iron. The electric soldering iron comprises a heating body, an operation handle, a feeding roller wheel, a soldering iron rod, a welding head, a material guiding pipe, a feeding pressing rod, a one-way rack and a return spring. The electric soldering iron is characterized in that the operation handle is connected with the soldering iron rod, a feeding device is arranged on the operation handle, a small hole is formed in a heating body wall to facilitate feeding from the material guiding pipe to the interior of the heating body, a cavity is formed in the heating body, melted welding flux is stored into the cavity, a discharging hole is formed in the welding head, the welding flux is conveyed into the cavity in the heating body through the feeding device, heated and melted and then flows out from the discharging hole of the welding head to achieve welding. The electric soldering iron is novel and reasonable in structure, the automatic feeding device is arranged, single-hand feeding and welding actions can be achieved, welding is more accurate and more convenient, operation is simple, the welding efficiency is high, and the electric soldering iron is safer.