Afterburning combustor used in waste heat boiler of gas turbine

The utility model discloses an afterburning combustor used in a waste heat boiler of a gas turbine. The afterburning combustor comprises a chemical tail gas tube, an ignition device and a flame stabilizing component, wherein a plurality of ejection holes in parallel are formed in one side of a combustion part of the chemical tail gas tube; an ejection tube is vertically extended outwards from each ejection hole; the cross section area of an air flow channel of each ejection tube is 10-20 times of the cross section area of each ejection hole; the flame stabilizing component comprises an inner flame stabilizing cover and an outer flame stabilizing cover which are provided with a V-shaped structure respectively; the inner flame stabilizing cover is integrally formed; V-shaped grooves, flat bottoms and inclined walls are sequentially formed from the center to two sides of the inner flame stabilizing cover; a first through hole and a second through hole parallel to the ejection tubes are sequentially formed from i