The invention discloses a multifunctional dual-purpose electric soldering iron. The multifunctional dual-purpose electric soldering iron comprises an electric soldering iron handle, and a hollow welding head mounted at one end of the electric soldering iron handle, wherein a tin inlet is formed in the hollow welding head; a sliding high-temperature resistant piston is arranged inside the hollow cavity of the hollow welding head. The multifunctional dual-purpose electric soldering iron has the advantages that the electric soldering iron can be operated with one hand conveniently and fast; the welding fluid can be reused to achieve the purposes of saving energy and lowering consumption.