Abstract: A glue gun which includes a housing, a barrel slidably mounted in the front side of the housing, the barrel defining a heating chamber and a fusion chamber above the heating chamber, one-way clamp provided inside the housing to hold a glue stick, permitting the glue stick to be fed into the fusion chamber, a igniter and gas burner unit mounted in the housing and controlled by an ignition control switch to burn fuel gas in the heating chamber, the igniter and gas burner unit having a metal screw tube for holding a soldering tip in front of a flame nozzle thereof.