The invention provides a pneumatic electric soldering iron and belongs to the field of hardware tools. The pneumatic electric soldering iron comprises an air cylinder type liner with the lower end in a conical shape; the conical lower end of the liner is provided with a solder wire through for solder wires to pass through; the outside of the liner is provided with a heating device and wrapped with a heat insulating case, the inside of the liner is provided with a piston which can slide in the axial direction of the liner, and one end of the piston is matched with a press rod. The pneumatic electric soldering iron greatly improves the soldering efficiency, saves resources and is simple in structure and low in cost.