The invention relates to an electric soldering iron, comprising a handle, a heating core and a welding head, wherein the heating core is arranged in the handle and is in contact with the welding head, and the lower part of the welding head is of a semi-conical structure. The electric soldering iron is characterized in that a groove is formed in the lower part of the welding head, a flow channel is formed below the groove, one end of the flow channel is communicated with the groove, and the other end of the flow channel is communicated all through to a tail end at the lower part of the welding head. The electric soldering iron provided by the invention has the advantages of convenience for welding, safety and reliability, and a welded circuit joint has an attractive overall appearance.