A buckle set for a sliding rail of an industrial rackmount chassis includes a base, a pressing member, a hook slider and a hook rod. The buckle set is provided for installing the sliding rail into the industrial rackmount chassis. The installed hook rod is fixed automatically to prevent it from falling off. A slope pushing design between the pressing member and the hook slider drives the hook rod to shift and retract in order to remove the sliding rail quickly. A safety buckle design is added to the pressing member, such that after the hook rod is fixed to the industrial rackmount chassis, the pressing member is locked automatically to prevent the sliding rail from falling off due to human wrong operations. When it is necessary to remove the sliding rail, the safety buckle and the pressing member are pressed simultaneously to release the locked status quickly.