The invention relates to a gel cap sleeving tool of an injector for gas chromatography detection. The gel cap sleeving tool comprises a clamping mechanism, a lifting mechanism and a limitation piece,wherein the clamping mechanism is used for clamping a gel cap, the lifting mechanism is connected with the clamping mechanism and is used for driving the clamping mechanism to ascend and descend, andthe gel cap on the clamping mechanism can prop against the limitation piece after the clamping mechanism is driven to ascend by the lifting mechanism. During working, the gel cap is clamped by the clamping mechanism, the clamping mechanism is driven to be ascended to a special position by the lifting mechanism, so that gel cap props against the limitation piece, and the gel cap sleeves an injectorfor gas chromatography detection; after previous gel cap sleeving action is completed, the clamping mechanism is driven to descend by the lifting mechanism, so that the gel cap is clamped; and the clamping mechanism is driven to be ascended to the special position by the lifting mechanism, so that the gel cap sleeving action is repeated. By the gel cap sleeving tool of the injector for gas chromatography detection, artificial gel cap sleeving is substituted, the gel cap sleeving working efficiency is improved, and the harm of harmful gas in gas chromatography to human health is reduced.