The present invention provides a gas combustor having detachable combustion device, which includes: a housing having the interior installed with a base, and a combustion device. When the combustion device is inserted in an insertion slot of the housing, the upstream end of a mix pipe of the combustion device is airtightly inserted in a sleeve opening of the base, and a pair of locking sheets of the combustion device are moved along a pair of stopping protrusions of the housing and cross the pair of stopping protrusions, so a first spring between a lock button and a positioning seat of the combustion device is allowed to respectively be compressed for storing energy or stretched for releasing energy, and the pair of locking sheets are enabled to be abutted against inner edges of the pair of stopping protrusions, so an interference is generated for forming a locking and combining status.