The invention belongs to a gas fuel ignition device, in particular to an ignition gun. The ignition gun comprises a shell, a gun barrel, a steam box assembly, a piezoelectric block and a button assembly, wherein the button assembly comprises a first button and a second button; the first button is an ignition activation button, namely, the first button is used for controlling the steam box to discharge gas through a rocker switch; the first button is used for discharging through the piezoelectric block to generate spark on an ignition head in the gun barrel; the second button is an intentional guide safety button; the second button cannot be used for controlling the steam box to discharge gas or/and the piezoelectric block to be switched on. The ignition gun has the advantages of novel structure, and convenience for an adult to use and can effectively prevent a child from activating the ignition gun unexpectedly,.