An injector type electric soldering iron with soldering and sucking functions comprises an air bag arranged on the upper portion of the electric soldering iron. An air bag guiding pipe is arranged in the air bag, and an air bag reset spring is arranged outside the air bag guiding pipe. The air bag guiding pipe is connected with the air bag, and an air bag air conveying pipe is arranged on the lower portion of the air bag and is connected with an insulating heat-insulation guiding pipe through a feed inlet device. The insulating heat-insulation guiding pipe is connected with a discharge outlet through an internal heating type soldering tin melting cavity. A sliding feed switch is used for delivering soldering tin to the feed inlet device, and a flexible plastic air bag air conveying pipe achieves the function of air conveying in the soldering process. The soldering tin is melted to liquid in the soldering tin melting cavity and then flows out downwards from the ball pen head type discharge outlet. Through the principle that ink is output by squeezing the air bag and a ball pen head, precise discharging of the electric soldering iron like an injector can be achieved, and the electric soldering iron can also suck materials. Liquid soldering tin can flow out from the inside, surplus soldering tin can be heated and sucked back into an electric soldering iron cavity, and soldering and sucking are integrated; the electric soldering iron can be operated by one hand in soldering, precise soldering is achieved, and the electric soldering iron has the characteristics of preventing scalding and improving use efficiency of tin wires.