The present invention relates to a gas combustor, comprising: a gas intake valve, the bottom of a valve tube axially formed in a valve member is installed with a filter member, a first spring is installed above the filter member and inside the valve tube, the top of a valve pin is protruded out of a tube opening formed at and communicated with the top of the valve tube, a plug outwardly protruded at the bottom of the valve pin is abutted against the first spring, the plug is enabled to seal the tube opening through the first spring being stretched, and when the top of the valve pin is axially subject to a force, the valve pin and the plug are downwardly moved, the first spring is compressed thereby enabling the tube opening to be opened.