Gas combustion gun capable of optimizing ignition

The utility model discloses a gas combustion gun capable of optimizing ignition, which comprises a gun body, a first gas chamber, an air chamber and a second gas chamber are arranged in the gun body in a separated mode, and three input ports are arranged on the gun body and communicated with the first gas chamber, the air chamber and the second gas chamber respectively. The gun body is further provided with an output port communicated with the first gas chamber, the air chamber and the second gas chamber, and the output port is provided with an igniter. A gas pipeline is additionally arranged in the combustion gun, the first gas pipeline is used as a normally-open type and continuously supplies quantitative small-flow gas, the gas is mixed with air to form mixed gas with the matched proportion, the mixed gas can be ignited by the igniter to form small flames, a large amount of gas is introduced through the second gas pipeline, the flames are enlarged, and the use requirement is met. The precise switch for adj