The invention relates to electric soldering iron. The electric soldering iron comprises a heating core fixedly installed in a heat transferring arm and a soldering iron tip used for welding, a plurality of radiating holes are formed in the side wall of the heat transferring arm, a handle is arranged on the upper end face of the heat transferring arm, and a connection part is fixedly arranged at the upper end of the soldering iron tip; an installing and fixing groove which is provided with an opening cavity at the position close to the lower portion and matched with the connection part is formed in the heating core, movable grooves with opening cavities facing the installing and fixing groove are oppositely arranged on the left and right sides of the heating core, a movable support is installed in the movable grooves in a manner of being capable of moving vertically, and vertically-through guide holes are formed in the movable support in a left-and-right opposite manner; and guide rods are movably installed in the guide holes, and the upper and lower ends of the guide rods are fixedly installed in the upper and lower end walls of the movable grooves. The electric soldering iron is simple in structure, the soldering iron tip can be very conveniently installed and detached, and the using efficiency is greatly improved.