The invention discloses a gas chromatography device for detecting sulfuryl fluoride in a sulfur hexafluoride decomposition product. The gas chromatography device comprises a sulfur hexafluoride separation device, a capillary column sampling device, a Gaspro chromatographic column, a micro-plate flow path control valve and a second sulfide detector, wherein the capillary column sampling device comprises a first inlet, a second inlet and a first outlet which are communicated with one another; the second inlet is communicated with the sulfur hexafluoride separation device; auxiliary gas is fed through the first inlet; the micro-plate flow path control valve comprises a third inlet, a second outlet and a third outlet; the Gaspro chromatographic column is respectively communicated with the first outlet and the third inlet; the second sulfide detector is communicated with the second outlet. The gas chromatography device for detecting the sulfuryl fluoride in the sulfur hexafluoride decomposition product, provided by the invention, can be used for accurately detecting the sulfuryl fluoride.