A micro-gas combustion gun body, an ignition burner, a coal powder combustion system, and a coal-fired boiler, wherein the micro-gas combustion gun body comprises a combustion air duct (21), a gas supply device and an ignition device (24); the combustion air duct (21) comprises a combustion air inlet (211) and a flame opening (212); the gas supply means comprises a plurality of gas outlet parts, and the plurality of gas outlet parts and an ignition end of the ignition device (24) are disposed in the combustion air duct (21), the ignition end of the ignition device (24) is used to ignite the gas emitted from the plurality of gas outlet parts. Due to the gas supply device in the micro-gas combustion gun body comprising a plurality of gas outlet parts, during an ignition process, the micro-gas combustion gun body has a plurality of ignition points therein, and the plurality of ignition points can ignite each other and act as a combustion aid reciprocally. Hence, the micro-gas combustion gun body has a more stable flame.
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